WO2020106468A1 - Enhanced perovskite materials for photovoltaic devices - Google Patents

Enhanced perovskite materials for photovoltaic devices

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Publication number
WO2020106468A1
WO2020106468A1 PCT/US2019/060405 US2019060405W WO2020106468A1 WO 2020106468 A1 WO2020106468 A1 WO 2020106468A1 US 2019060405 W US2019060405 W US 2019060405W WO 2020106468 A1 WO2020106468 A1 WO 2020106468A1
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WO
WIPO (PCT)
Prior art keywords
perovskite material
lead
perovskite
group
iodide
Prior art date
Application number
PCT/US2019/060405
Other languages
English (en)
French (fr)
Inventor
Michael D. Irwin
Michael Holland
Nicholas Anderson
Original Assignee
Hee Solar, L.L.C.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hee Solar, L.L.C. filed Critical Hee Solar, L.L.C.
Priority to CN201980087633.1A priority Critical patent/CN113272312A/zh
Priority to MX2021005894A priority patent/MX2021005894A/es
Priority to AU2019384692A priority patent/AU2019384692A1/en
Priority to EP19886670.9A priority patent/EP3883939A4/en
Priority to KR1020217018579A priority patent/KR20210080572A/ko
Priority to CA3120258A priority patent/CA3120258A1/en
Priority to JP2021528880A priority patent/JP2022507895A/ja
Publication of WO2020106468A1 publication Critical patent/WO2020106468A1/en

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    • H01L21/02112—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer
    • H01L21/02172—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing at least one metal element, e.g. metal oxides, metal nitrides, metal oxynitrides or metal carbides
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    • H10K10/46—Field-effect transistors, e.g. organic thin-film transistors [OTFT]
    • H10K10/462—Insulated gate field-effect transistors [IGFETs]
    • H10K10/468—Insulated gate field-effect transistors [IGFETs] characterised by the gate dielectrics
    • H10K10/478—Insulated gate field-effect transistors [IGFETs] characterised by the gate dielectrics the gate dielectric comprising a layer of composite material comprising interpenetrating or embedded materials, e.g. TiO2 particles in a polymer matrix
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    • H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/50—Organic perovskites; Hybrid organic-inorganic perovskites [HOIP], e.g. CH3NH3PbI3
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    • Y02E10/549—Organic PV cells

Definitions

  • PVs photovoltaics
  • PVs may incorporate layers of perovskite materials as photoactive layers that generate electric power when exposed to light. Some photoactive layers may be degraded by environmental factors including temperature, humidity, and oxidation. Therefore, improvements to perovskite material durability and efficiency are desirable.
  • a perovskite material has a perovskite crystal lattice having a formula of C x M y X Z where x, y, and z, are real numbers.
  • Bulky organic cations reside near a surface or a grain boundary of the perovskite crystal lattice.
  • C includes one or more cations selected from the group consisting of Group 1 metals, Group 2 metals, ammonium, formamidinium, guanidinium, and ethene tetramine.
  • M includes one or more metals each selected from the group consisting of Be, Mg, Ca, Sr, Ba, Fe, Cd, Co, Ni, Cu, Ag, Au, Hg, Sn, Ge, Ga, Pb, In, Tl, Sb, Bi, Ti, Zn, Cd, Hg, and Zr and combinations thereof.
  • X includes one or more anions each selected from the group consisting of halides, pseudohalides, chalcogenides (tellurides, oxides, sulfides, and selenides), and combinations thereof.
  • a tail group of at least one bulky organic cations is not chemically connected to the surfaces or grain boundaries of the perovskite material.
  • the bulky organic cations reside less than 50 nm into the perovskite material crystal lattice from the surfaces or grain boundaries of the perovskite material crystal lattice.
  • the bulky organic cation is selected from the group consisting of n-butylammonium; benzylammonium; butane- 1,4-diammonium; pentylammonium; hexylammonium; poly(vinylammonium); phenylethylammonium; 3 -phenyl- 1-propylammonium; 4-phenyl- 1 -butylammonium; 1, 3 -dimethylbutyl ammonium; 3 , 3 -dimethylbutyl ammonium, and 1- octylammonium, and combinations thereof.
  • the bulky organic cation comprises 1 -butylammonium.
  • the bulky organic cation comprises 1 -hexylammonium.
  • the bulky organic cation comprises 1 -octyl amm onium .
  • the bulky organic cation comprises benzylammonium.
  • the perovskite material crystal lattice has a cubic structure.
  • a perovskite material includes a formamidinium lead iodide perovskite material. Benzylammonium cations reside near a surface or a grain boundary of the formamidinium lead iodide perovskite material.
  • At least one benzyl group of the benzylammonium cations is not chemically connected to the grain boundaries or surfaces of the formamidinium lead iodide perovskite material.
  • the benzylammonium cations reside less than 50 nm into the formamidinium lead perovskite material from the surfaces or the grain boundaries of the formamidinium lead perovskite material.
  • the formamidinium lead iodide perovskite material has a cubic crystal structure.
  • a method for depositing a perovskite material includes depositing a lead salt precursor onto a substrate to form a lead salt thin film, depositing a bulky organic cation solution onto the lead salt thin film, depositing a second salt precursor onto the lead salt thin film to form a perovskite precursor thin film, and annealing the substrate to form a perovskite material.
  • the bulky organic cation solution comprises a bulky organic cation selected from the group consisting of n-butylammonium; benzylammonium; butane- 1,4-diammonium; pentylammonium; hexylammonium; poly(vinylammonium); phenyl ethyl ammonium; 3 -phenyl- 1-propylammonium; 4-phenyl- 1 -butylammonium; 1,3- dimethylbutylammonium; 3 ,3 -dimethylbutylammonium, 1 -octyl ammonium, ammonium functionalized perylenes, and combinations thereof.
  • a bulky organic cation selected from the group consisting of n-butylammonium; benzylammonium; butane- 1,4-diammonium; pentylammonium; hexylammonium; poly(vinylammonium); phen
  • the bulky organic cation solution comprises 1- butylammonium.
  • the bulky organic cation solution comprises benzylammonium.
  • the bulky organic cation solution has a bulky organic cation concentration between 0.01 and 0.1 M.
  • the bulky organic cation solution has a bulky organic cation concentration between 0.03 and 0.05 M.
  • the lead salt precursor, the second salt precursor, and the bulky cation solution are deposited by spin-coating, slot-die printing, sputtering, PE-CVD, thermal evaporation, or spray coating.
  • the lead salt precursor comprises one or more lead salts selected from the group consisting of lead (P) iodide, lead (II) thiocyanate, lead (P) chloride, lead (P) bromide, and combinations thereof.
  • the lead salt precursor comprises lead (II) iodide.
  • the second salt precursor comprises formamidinium iodide, formamidinium thiocyanate, or guanidinium thiocyanate.
  • the second salt precursor comprises formamidinium iodide.
  • the lead salt precursor comprises one or more solvents selected from the group consisting of N-cyclohexyl-2-pyrrolidone, alkyl-2-pyrrolidone, dimethylformamide, dialkylformamide, dimethylsulfoxide (DMSO), methanol, ethanol, propanol, butanol, tetrahydrofuran, formamide, tert-butylpyridine, pyridine, alkylpyridine, pyrrolidine, chlorobenzene, dichlorobenzene, dichloromethane, chloroform, and combinations thereof.
  • solvents selected from the group consisting of N-cyclohexyl-2-pyrrolidone, alkyl-2-pyrrolidone, dimethylformamide, dialkylformamide, dimethylsulfoxide (DMSO), methanol, ethanol, propanol, butanol, tetrahydrofuran, formamide, tert-butylpyridine, pyridine, alkylpyridine,
  • the lead salt precursor comprises one or more additives selected from the group consisting of an amino acid, 5-aminovaleric acid hydroiodide, 1,8- diiodooctane, 1,8-dithiooctane, formamidinium halide, acetic add, trifluoroacetic acid, a methylammonium halide, water, and combinations thereof.
  • the lead salt precursor comprises a 90: 10 mole ratio of Pbb to PbCh dissolved in anhydrous DMF.
  • annealing occurs in an atmosphere selected from the group consisting of ambient air, a controlled humidity environment, pure argon, pure nitrogen pure oxygen, pure hydrogen, pure helium, pure neon, pure krypton, pure CO2, and combinations thereof.
  • annealing occurs at a temperature greater than or equal to 50 °C and less than or equal to 300 °C.
  • annealing in a controlled humidity environment occurs at an absolute humidity greater than or equal to 0 g H20/m 3 air and less than or equal to 20 g H 2 O/m 3 air.
  • annealing in a controlled humidity environment occurs at an absolute humidity between about 4 and 7 g H 2 O/m 3 air.
  • a perovskite material includes a perovskite crystal lattice having a formula of C x M y X z , where x, y, and z, are real numbers. 1,4-diammonium butane cations are disposed within or at a surface of the perovskite crystal lattice.
  • C comprises one or more cations selected from the group consisting of Group 1 metals, Group 2 metals, ammonium, formamidinium, guanidinium, and ethene tetramine
  • M comprises one or more metals each selected from the group consisting of Be, Mg, Ca, Sr, Ba, Fe, Cd, Co, Ni, Cu, Ag, Au, Hg, Sn, Ge, Ga, Pb, In, Tl, Sb, Bi, Ti, Zn, Cd, Hg, and Zr and combinations thereof
  • X comprises one or more anions each selected from the group consisting of halides, pseudohalides, chalcogenides, and combinations thereof.
  • the 1,4-diammonium butane cations have a concentration between 1 mol% and 20 mol% in the perovskite material.
  • the 1,4-diammonium butane cations have a concentration between 1 mol% and 5 mol% in the perovskite material.
  • the 1,4-diammonium butane cations have a concentration of approximately 5 mol% in the perovskite material.
  • C comprises formamidinium
  • M comprises lead
  • X comprises iodide
  • the perovskite material crystal lattice has a cubic structure.
  • ammonium groups of the 1,4-diammonium butane cations substitute for formamidinium ions within the perovskite crystal lattice.
  • a perovskite material includes a formamidinium lead iodide perovskite material and 1,4-diammonium butane cations disposed within or at a surface of the formamidinium lead iodide perovskite material.
  • ammonium groups of the 1,4-diammonium butane cations substitute for formamidinium ions within the perovskite crystal lattice.
  • the 1,4-diammonium butane cations have a concentration between 1 mol% and 20 mol% in the perovskite material.
  • the 1,4-diammonium butane cations have a concentration between 1 mol% and 5 mol% in the perovskite material.
  • the 1,4-diammonium butane cations have a concentration of approximately 5 mol% in the perovskite material.
  • the formamidinium lead iodide perovskite material has a cubic crystal structure.
  • a method for depositing perovskite material includes depositing a lead salt precursor onto a substrate to form a lead salt thin film.
  • the lead salt precursor comprises a lead salt and a 1,4-diammonium butane salt.
  • a second salt precursor may be deposited onto the lead salt thin film to form a perovskite precursor thin film.
  • the substrate and perovskite precursor thin film may be annealed to form a perovskite material.
  • the lead salt precursor has a 1,4-diammonium butane concentration between 1 mol% and 20 mol%.
  • the lead salt precursor has a 1,4-diammonium butane concentration between 1 mol% and 5 mol%.
  • the lead salt precursor has a 1,4-diammonium butane concentration of approximately 5 mol%.
  • the lead salt precursor comprises one or more lead salts selected from the group consisting of lead (P) iodide, lead (II) thiocyanate, lead (P) chloride, lead (P) bromide, and combinations thereof.
  • the lead salt precursor comprises lead (II) iodide.
  • the second salt precursor comprises a salt selected from the group consisting of formamidinium iodide, formamidinium thiocyanate, guanidinium thiocyanate, and combinations thereof.
  • the second salt precursor comprises formamidinium iodide.
  • the lead salt precursor comprises one or more solvents selected from the group consisting of N-cyclohexyl-2-pyrrolidone, alkyl-2-pyrrolidone, dimethylformamide, dialkylformamide, dimethylsulfoxide, methanol, ethanol, propanol, butanol, tetrahydrofuran, formamide, tert-butylpyridine, pyridine, alkylpyridine, pyrrolidine, chlorobenzene, dichlorobenzene, dichloromethane, chloroform, and combinations thereof.
  • solvents selected from the group consisting of N-cyclohexyl-2-pyrrolidone, alkyl-2-pyrrolidone, dimethylformamide, dialkylformamide, dimethylsulfoxide, methanol, ethanol, propanol, butanol, tetrahydrofuran, formamide, tert-butylpyridine, pyridine, alkylpyridine, pyrrolidine, chlor
  • the lead salt precursor comprises one or more additives selected from the group consisting of an amino acid, 5-aminovaleric acid hydroiodide, 1,8- diiodooctane, 1,8-dithiooctane, formamidinium halide, acetic add, trifluoroacetic acid, a methylammonium halide, water, and combinations thereof.
  • the lead salt precursor comprises a 90: 10 mole ratio of Pbb to PbCh dissolved in anhydrous dimethylformamide.
  • annealing occurs in an atmosphere selected from the group consisting of ambient air, a controlled humidity environment, pure argon, pure nitrogen pure oxygen, pure hydrogen, pure helium, pure neon, pure krypton, pure CO2, and combinations thereof.
  • annealing occurs at a temperature greater than or equal to 50 °C and less than or equal to 300 °C.
  • annealing in a controlled humidity environment occurs at an absolute humidity greater than or equal to 0 g H 2 O/m 3 air and less than or equal to 20 g H 2 O/m 3 air.
  • annealing in a controlled humidity environment occurs at an absolute humidity between about 4 and 7 g H 2 O/m 3 air.
  • a method for depositing perovskite material includes depositing a lead salt precursor onto a substrate to form a lead salt thin film. Next, a 1,4- diammonium butane salt precursor is deposited onto the lead salt thin film. Next, a third salt precursor may be deposited onto the lead salt thin film to form a perovskite precursor thin film. Next, the substrate and perovskite precursor thin film may be annealed to form a perovskite material.
  • the lead salt precursor has a 1,4-diammonium butane concentration between 1 mol% and 5 mol%.
  • the lead salt precursor comprises lead (II) iodide and the third salt precursor comprises formamidinium iodide.
  • the lead salt precursor comprises a 90: 10 mole ratio of Pbh to PbCh dissolved in anhydrous dimethylformamide and comprises as much as 10 mol% cesium. Annealing occurs at a temperature greater than or equal to 50 °C and less than or equal to 300 °C.
  • FIGURE 1 is a schematic view of a typical photovoltaic cell including an active layer according to some embodiments of the present disclosure.
  • FIGURE 2 is a stylized diagram showing components of an example PV device according to some embodiments of the present disclosure.
  • FIGURE 3 is a stylized diagram showing components of an example device according to some embodiments of the present disclosure.
  • FIGURE 4 is a stylized diagram showing components of an example device according to some embodiments of the present disclosure.
  • FIGURE 5 is a stylized diagram showing an illustration of a Ruddlesden-Popper perovskite.
  • FIGURE 6 is a stylized diagram showing an illustration of a perovskite material with addition of an alkyl ammonium cation according to some embodiments of the present disclosure.
  • FIGURE 7 is a stylized diagram showing an illustration of a perovskite material with a 1 -butylammonium surface layer according to some embodiments of the present disclosure.
  • FIGURE 8 is a stylized diagram showing an illustration of a perovskite material with a surface layer of multiple bulky organic cations according to some embodiments of the present disclosure.
  • FIGURE 8A is a stylized diagram showing an illustration of a perovskite material with a surface layer of multiple bulky organic cations according to some embodiments of the present disclosure.
  • FIGURE 9 is an illustration of a comparison of images taken of a perovskite material with and without a 1 -butylammonium (“BAT’) surface coating according to some embodiments of the present disclosure.
  • FIGURE 10 is a stylized diagram showing an illustration of a comparison of images taken of a perovskite material with and without a 1 -butylammonium (“BAT’) surface coating according to some embodiments of the present disclosure.
  • BAT 1 -butylammonium
  • FIGURES 11 A-D illustrate various perylene monoimides and diimides that may be applied to the surface of a perovskite material according to some embodiments of the present disclosure.
  • FIGURE 12 is a stylized diagram showing an illustration of a perovskite material with addition of a perylene monoimides ammonium cation according to some embodiments of the present disclosure.
  • FIGURE 13 is a stylized diagram showing an illustration of 1,4-diammonium butane incorporated into the crystal lattice of a formamidinium lead iodide perovskite material according to some embodiments of the present disclosure.
  • FIGURE 14 is an illustration of x-ray diffraction peaks (XRD) for perovskite having various concentrations of 1,4-diammonium butane according to some embodiments of the present disclosure.
  • FIGURE 15 provides images of perovskite material samples having various concentrations of 1,4-diammonium butane over time according to some embodiments of the present disclosure.
  • FIGURE 16 provides illustrations of poly-ammonium alkyl cations, according to some embodiments of the present disclosure.
  • FIGURE 16A is a stylized diagram showing an illustration of 1,8 diammonium octane incorporated into the crystal lattice of a formamidinium lead iodide perovskite material according to some embodiments of the present disclosure.
  • FIGURE 16B is a stylized diagram showing an illustration of bis(4-aminobutyl)- ammonium incorporated into the crystal lattice of a formamidinium lead iodide perovskite material according to some embodiments of the present disclosure.
  • FIGURE 16C is a stylized diagram showing an illustration of tris(4-aminobutyl)- ammonium incorporated into the crystal lattice of a formamidinium lead iodide perovskite material according to some embodiments of the present disclosure.
  • FIGURES 17-28 provide illustrations of the structures of certain organic molecules, according to some embodiments of the present disclosure.
  • FIGURE 29 illustrates x-ray diffraction patterns of perovskites materials according to some embodiments of the present disclosure.
  • FIGURE 30 provides a stylized illustration of thicknesses of inorganic metal halide sublattices of perovskite materials according to some embodiments of the present disclosure.
  • FIGURE 31 shows optical and photoluminescence images of perovskite material photovoltaic devices according to some embodiments of the present disclosure.
  • FIGURE 32 illustrates power output curves of perovskite material photovoltaic devices according to some embodiments of the present disclosure.
  • FIGURE 33 illustrates current-voltage (I-V) scans of perovskite material photovoltaic devices according to some embodiments of the present disclosure.
  • FIGURE 34 illustrates box plots for open-circuit voltage (Voc), short-circuit current density (Jsc), Fill Factor (FF) and power conversion efficiency (PCE) for perovskite material photovoltaic devices according to some embodiments of the present disclosure.
  • FIGURE 35 illustrates external quantum efficiency (EQE) curves of perovskite material photovoltaic devices according to some embodiments of the present disclosure.
  • FIGURE 36 shows admittance spectroscopy plots of perovskite material photovoltaic devices according to some embodiments of the present disclosure.
  • Improvements in various aspects of PV technologies compatible with organic, non- organic, and/or hybrid PVs promise to further lower the cost of both organic PVs and other PVs.
  • some solar cells such as perovskite PV solar cells, may take advantage of novel cost- effective and high-stability alternative components, such as nickel oxide interfacial layers.
  • various kinds of solar cells may advantageously include chemical additives and other materials that may, among other advantages, be more cost-effective and durable than conventional options currently in existence.
  • the present disclosure relates generally to compositions of matter, apparatus and methods of use of materials in photovoltaic cells in creating electrical energy from solar radiation. More specifically, this disclosure relates to photoactive and other compositions of matter, as well as apparatus, methods of use, and formation of such compositions of matter.
  • Some or all of materials in accordance with some embodiments of the present disclosure may also advantageously be used in any organic or other electronic device, with some examples including, but not limited to: batteries, field-effect transistors (FETs), light-emitting diodes (LEDs), non-linear optical devices, memristors, capacitors, rectifiers, and/or rectifying antennas.
  • FETs field-effect transistors
  • LEDs light-emitting diodes
  • non-linear optical devices memristors, capacitors, rectifiers, and/or rectifying antennas.
  • the present disclosure may provide PV and other similar devices (e.g., batteries, hybrid PV batteries, multi-junction PVs, FETs, LEDs, x-ray detectors, gamma ray detectors, photodiodes, CCDs, etc.).
  • Such devices may in some embodiments include improved active material, interfacial layers (IFLs), and/or one or more perovskite materials.
  • IFLs interfacial layers
  • a perovskite material may be incorporated into various of one or more aspects of a PV or other device.
  • a perovskite material may be of the general formula CMXs, where: C comprises one or more cations (e.g., an amine, ammonium, phosphonium, a Group 1 metal, a Group 2 metal, and/or other cations or cation-like compounds); M comprises one or more metals (examples including Be, Mg, Ca, Sr, Ba, Fe, Cd, Co, Ni, Cu, Ag, Au, Hg, Sn, Ge, Ga, Pb, In, Tl, Sb, Bi, Ti, Zn, Cd, Hg, and Zr); and X comprises one or more anions.
  • C comprises one or more cations (e.g., an amine, ammonium, phosphonium, a Group 1 metal, a Group 2 metal, and/or other cations or cation-like compounds); M comprises one or more metals (examples including Be, Mg, Ca, Sr, Ba, Fe, Cd, Co, Ni, Cu,
  • An example PV architecture may be substantially of the form substrate-anode-IFL-active layer-IFL-cathode.
  • the active layer of some embodiments may be photoactive, and/or it may include photoactive material. Other layers and materials may be utilized in the cell as is known in the art.
  • the use of the term“active layer” is in no way meant to restrict or otherwise define, explicitly or implicitly, the properties of any other layer—for instance, in some embodiments, either or both IFLs may also be active insofar as they may be semiconducting.
  • IFLs may also be active insofar as they may be semiconducting.
  • a stylized generic PV cell 1000 is depicted, illustrating the highly interfacial nature of some layers within the PV.
  • the PV 1000 represents a generic architecture applicable to several PV devices, such as perovskite material PV embodiments.
  • the PV cell 1000 includes a transparent substrate layer 1010, which may be glass (or a material similarly transparent to solar radiation) which allows solar radiation to transmit through the layer.
  • the transparent layer of some embodiments may also be referred to as a superstrate or substrate (e.g., as with substrate layer 3901 of FIG. 2), and it may comprise any one or more of a variety of rigid or flexible materials such as: glass, polyethylene, polypropylene, polycarbonate, polyimide, PMMA, PET, PEN, Kapton, or quartz.
  • the photoactive layer 1040 may be composed of electron donor or /7-type material, and/or an electron acceptor or «-type material, and/or an ambipolar semiconductor, which exhibits both p- and n-type material characteristics, and/or an intrinsic semiconductor which exhibits neither n-type or p-type characteristics.
  • Photoactive layer 1040 may be a perovskite material as described herein, in some embodiments.
  • the active layer or, as depicted in FIG. 1, the photo-active layer 1040, is sandwiched between two electrically conductive electrode layers 1020 and 1060. In FIG.
  • the electrode layer 1020 may be a transparent conductor such as a tin-doped indium oxide (GGO material) or other material as described herein.
  • second substrate 1070 and second electrode 1060 may be transparent.
  • an active layer of some embodiments need not necessarily be photoactive, although in the device shown in FIG. 1, it is.
  • the electrode layer 1060 may be an aluminum material or other metal, or other conductive materials such as carbon. Other materials may be used as is known in the art.
  • the cell 1010 also includes an interfacial layer (IFL) 1030, shown in the example of FIG. 1.
  • the IFL may assist in charge separation.
  • the IFL 1030 may comprise a multi-layer IFL, which is discussed in greater detail below.
  • IFL 1050 adjacent to electrode 1060 there also may be an IFL 1050 adjacent to electrode 1060.
  • the IFL 1050 adjacent to electrode 1060 may also or instead comprise a multi-layer IFL (again, discussed in greater detail below).
  • An IFL may be semiconducting in character and may be either intrinsic, ambipolar, /7-type, or «-type, or it may be dielectric in character.
  • the IFL on the cathode side of the device e.g., IFL 1050 as shown in FIG. 1
  • the IFL on the anode side of the device e.g., IFL 1030 as shown in FIG. 1 may be «-type.
  • the cathode-side IFL may be «-type and the anode-side IFL may be p- type.
  • the cell 1010 may be attached to electrical leads by electrodes 1060 and 1020 and a discharge unit, such as a battery, motor, capacitor, electric grid, or any other electrical load.
  • Various embodiments of the present disclosure provide improved materials and/or designs in various aspects of solar cell and other devices, including among other things, active materials (including hole-transport and/or electron-transport layers), interfacial layers, and overall device design.
  • active materials including hole-transport and/or electron-transport layers
  • interfacial layers including interfacial layers, and overall device design.
  • the present disclosure provides advantageous materials and designs of one or more interfacial layers within a PV, including thin-coat IFLs.
  • Thin-coat IFLs may be employed in one or more IFLs of a PV according to various embodiments discussed herein.
  • devices may optionally include an interfacial layer between any two other layers and/or materials, although devices need not contain any interfacial layers.
  • a perovskite material device may contain zero, one, two, three, four, five, or more interfacial layers (such as the example device of FIG. 2, which contains five interfacial layers 3903, 3905, 3907, 3909, and 3911).
  • An interfacial layer may include any suitable material for enhancing charge transport and/or collection between two layers or materials; it may also help prevent or reduce the likelihood of charge recombination once a charge has been transported away from one of the materials adjacent to the interfacial layer.
  • An interfacial layer may additionally physically and electrically homogenize its substrates to create variations in substrate roughness, dielectric constant, adhesion, creation or quenching of defects (e.g., charge traps, surface states).
  • Suitable interfacial materials may include any one or more of: Ag; Al; Au; B; Bi; Ca; Cd; Ce; Co; Cu; Fe; Ga; Ge; H; In; Mg; Mn; Mo; Nb; Ni; Pt; Sb; Sc; Si; Sn; Ta; Ti; V; W; Y; Zn; Zr; carbides of any of the foregoing metals (e.g., SiC, FesC, WC, VC, MoC, NbC); silicides of any of the foregoing metals (e.g., Mg 2 Si, SrSh, Sn 2 Si); oxides of any of the foregoing metals (e.g., alumina, silica, titania, SnCh, ZnO, NiO
  • an interfacial layer may include perovskite material.
  • interfacial layers may comprise doped embodiments of any interfacial material mentioned herein (e.g., Y-doped ZnO, N-doped single-wall carbon nanotubes).
  • Interfacial layers may also comprise a compound having three of the above materials (e.g., CuTiO 3 , Zn 2 SnO 4 or a compound having four of the above materials (e.g., CoNiZnO).
  • the materials listed above may be present in a planar, mesoporous or otherwise nano-structured form (e.g. rods, spheres, flowers, pyramids), or aerogel structure.
  • one or more IFLs may comprise a photoactive organic compound of the present disclosure as a self-assembled monolayer (SAM) or as a thin film.
  • SAM self-assembled monolayer
  • a photoactive organic compound of the present disclosure may comprise a binding group through which it may be covalently or otherwise bound to the surface of either or both of the anode and cathode.
  • the binding group of some embodiments may comprise any one or more of COOH, S1X3 (where X may be any moiety suitable for forming a ternary silicon compound, such as Si(OR)3 and S1CI3), SO3, PO 4 H, OH, CH 2 X (where X may comprise a Group 17 halide), and O.
  • the binding group may be covalently or otherwise bound to an electron-withdrawing moiety, an electron donor moiety, and/or a core moiety.
  • the binding group may attach to the electrode surface in a manner so as to form a directional, organized layer of a single molecule (or, in some embodiments, multiple molecules) in thickness (e.g., where multiple photoactive organic compounds are bound to the anode and/or cathode).
  • the SAM may attach via covalent interactions, but in some embodiments, it may attach via ionic, hydrogen-bonding, and/or dispersion force (i,e., Van Der Waals) interactions. Furthermore, in certain embodiments, upon light exposure, the SAM may enter into a zwitterionic excited state, thereby creating a highly-polarized IFL, which may direct charge carriers from an active layer into an electrode (e.g., either the anode or cathode). This enhanced charge-carrier injection may, in some embodiments, be accomplished by electronically poling the cross-section of the active layer and therefore increasing charge-carrier drift velocities towards their respective electrode (e.g., hole to anode; electrons to cathode).
  • Molecules for anode applications of some embodiments may comprise tunable compounds that include a primary electron donor moiety bound to a core moiety, which in turn is bound to an electron-withdrawing moiety, which in turn is bound to a binding group.
  • IFL molecules may comprise a tunable compound comprising an electron poor moiety bound to a core moiety, which in turn is bound to an electron donor moiety, which in turn is bound to a binding group.
  • a photoactive organic compound When a photoactive organic compound is employed as an IFL according to such embodiments, it may retain photoactive character, although in some embodiments it need not be photoactive.
  • Metal oxides may be used in thin film IFLs of some embodiments and may include semiconducting metal oxides, such as NiO, SnCh WO3, V 2 O5, or M0O3.
  • the second (e.g., n-type) active material comprises T1O 2 coated with a thin-coat IFL comprising AI 2 O3
  • a precursor material such as A1(Nq3)3 ⁇ cH 2 q, or any other material suitable for depositing AI 2 O3 onto the T1O 2 , followed by thermal annealing and dye coating.
  • the coating may be formed with a precursor material such as Na 2 Mo 4 e 2H 2 0; whereas a V 2 O5 coating according to some embodiments may be formed with a precursor material such as NaVCh; and a WO3 coating according to some embodiments may be formed with a precursor material such as NaWCVItO.
  • the concentration of precursor material e.g., A1(Nq3)3 ⁇ cH 2 q
  • modifying the concentration of precursor material may be a method by which the final film thickness may be controlled. For example, greater film thickness may result from greater precursor material concentration.
  • a method of some embodiments may include coating a TiCh (or other mesoporous) layer using a precursor material having a concentration in the range of approximately 0.5 to 10.0 mM; other embodiments may include coating the layer with a precursor material having a concentration in the range of approximately 2.0 to 6.0 mM; or, in other embodiments, approximately 2.5 to 5.5 mM.
  • AI2O3 and/or alumina it should be noted that various ratios of aluminum and oxygen may be used in forming alumina.
  • embodiments may include any one or more aluminum-oxide compounds, each having an aluminum oxide ratio according to AlxOy, where x may be any value, integer or non-integer, between approximately 1 and 100. In some embodiments, x may be between approximately 1 and 3 (and, again, need not be an integer). Likewise, y may be any value, integer or non-integer, between 0.1 and 100.
  • y may be between 2 and 4 (and, again, need not be an integer).
  • various crystalline forms of AlxOy may be present in various embodiments, such as alpha, gamma, and/or amorphous forms of alumina.
  • NiO, M0O3, WO3, and V2O5 such compounds may instead or in addition be represented as NixO y MoxOy, W x O y , and V x O y , respectively.
  • x may be any value, integer or non-integer, between approximately 0.5 and 100; in some embodiments, it may be between approximately 0.5 and 1.5.
  • y may be any value, integer or non-integer, between approximately 1 and 100. In some embodiments, y may be any value between approximately 1 and 4.
  • x may be any value, integer or non-integer, between approximately 0.5 and 100; in some embodiments, it may be between approximately 0.5 and 1.5.
  • y may be any value, integer or non-integer, between approximately 1 and 100; in certain embodiments, it may be an integer or non-integer value between approximately 1 and 10.
  • x and y may have values so as to be in a non-stoichiometric ratio.
  • the IFL may comprise a titanate.
  • a titanate according to some embodiments may be of the general formula M’TiCh, where M’ comprises any 2+ cation.
  • M’ may comprise a cationic form of Be, Mg, Ca, Sr, Ba, Ni, Zn, Cd, Hg, Cu, Pd, Pt, Sn, or Pb.
  • the IFL may comprise a single species of titanate, which in other embodiments, the IFL may comprise two or more different species of titanates.
  • the titanate has the formulaSrTiO 3 ,
  • the titanate may have the formula BaTiCh.
  • the titanate may have the formula CaTiCh.
  • titanates have a perovskite crystalline structure and strongly seed the perovskite material (e.g., methylammonium lead iodide (MAPbL ⁇ ), and formamidinium lead iodide (FAPbL ⁇ )) growth conversion process.
  • perovskite material e.g., methylammonium lead iodide (MAPbL ⁇ ), and formamidinium lead iodide (FAPbL ⁇ ) growth conversion process.
  • MMV ⁇ methylammonium lead iodide
  • FAPbL ⁇ formamidinium lead iodide
  • Titanates generally also meet other IFL requirements, such as ferroelectric behavior, sufficient charge carrier mobility, optical transparency, matched energy levels, and high dielectric constant.
  • the IFL may comprise a zirconate.
  • a zirconate according to some embodiments may be of the general formula M’ZrO 3 , where M’ comprises any 2+ cation.
  • M’ may comprise a cationic form of Be, Mg, Ca, Sr, Ba, Ni, Zn, Cd, Hg, Cu, Pd, Pt, Sn, or Pb.
  • the IFL may comprise a single species of zirconate, which in other embodiments, the IFL may comprise two or more different species of zirconate.
  • the zirconate has the formula SrZrO 3 .
  • the zirconate may have the formula BaZrO 3 .
  • the zirconate may have the formula CaZrO 3 .
  • zirconates have a perovskite crystalline structure and strongly seed the perovskite material (e.g., MAPbL ⁇ , FAPbL ⁇ ) growth conversion process.
  • Zirconates generally also meet other IFL requirements, such as ferroelectric behavior, sufficient charge carrier mobility, optical transparency, matched energy levels, and high dielectric constant.
  • the IFL may comprise a stannate.
  • a stannate according to some embodiments may be of the general formula M’SnO 3 , or M' 2 SnO 4 where M’ comprises any 2+ cation.
  • M’ may comprise a cationic form of Be, Mg, Ca, Sr, Ba, Ni, Zn, Cd, Hg, Cu, Pd, Pt, Sn, or Pb.
  • the IFL may comprise a single species of stannate, which in other embodiments, the IFL may comprise two or more different species of stannate.
  • the stannate has the formula SrSnCh.
  • the stannate may have the formula BaSnCh. In yet another embodiment, the stannate may have the formula CaSnCh.
  • stannates have a perovskite crystalline structure and strongly seed the perovskite material (e.g., MAPbL ⁇ , FAPbL ⁇ ) growth conversion process. Stannates generally also meet other IFL requirements, such as ferroelectric behavior, sufficient charge carrier mobility, optical transparency, matched energy levels, and high dielectric constant.
  • the IFL may comprise a plumbate.
  • a plumbate according to some embodiments may be of the general formula M’PbCh, where M’ comprises any 2+ cation.
  • M’ may comprise a cationic form of Be, Mg, Ca, Sr, Ba, Ni, Zn, Cd, Hg, Cu, Pd, Pt, Sn, or Pb.
  • the IFL may comprise a single species of plumbate, which in other embodiments, the IFL may comprise two or more different species of plumbate.
  • the plumbate has the formula SrPbCh.
  • the plumbate may have the formula BaPbCh.
  • the plumbate may have the formula CaPbCh.
  • the plumbate may have the formula Pb II Pb IV O 3 .
  • plumbate s have a perovskite crystalline structure and strongly seed the perovskite material (e.g., MAPbL ⁇ , FAPbL ⁇ ) growth conversion process.
  • Plumbates generally also meet other IFL requirements, such as ferroelectric behavior, sufficient charge carrier mobility, optical transparency, matched energy levels, and high dielectric constant.
  • an IFL may comprise a combination of a zirconate and a titanate in the general formula where X is greater than 0 but less than one
  • M' comprises any 2+ cation.
  • M’ may comprise a cationic form of Be, Mg, Ca, Sr, Ba, Ni, Zn, Cd, Hg, Cu, Pd, Pt, Sn, or Pb.
  • the IFL may comprise a single species of zirconate, which in other embodiments, the IFL may comprise two or more different species of zirconate.
  • the zirconate/titanate combination has the formula In another embodiment, the zirconate/titanate combination has the
  • a zirconate/titanate combination have a perovskite crystalline structure and strongly seed the perovskite material (e.g., MAPbL, FAPbD) growth conversion process.
  • Zirconate/titanate combinations generally also meet other IFL requirements, such as ferroelectric behavior, sufficient charge carrier mobility, optical transparency, matched energy levels, and high dielectric constant.
  • the IFL may comprise a niobate.
  • a niobate according to some embodiments may be of the general formula M’NbCh, where: M’ comprises any 1+ cation.
  • M’ may comprise a cationic form of Li, Na, K, Rb, Cs, Cu, Ag, Au, Tl, ammonium, or H.
  • the IFL may comprise a single species of niobate, which in other embodiments, the IFL may comprise two or more different species of niobate.
  • the niobate has the formula LiNbCh.
  • the niobate may have the formula NaNbCh.
  • the niobate may have the formula AgNbCh.
  • niobates generally meet IFL requirements, such as piezoelectric behavior, non-linear optical polarizability, photoelasticity, ferroelectric behavior, Pockels effect, sufficient charge carrier mobility, optical transparency, matched energy levels, and high dielectric constant.
  • a perovskite material device may be formulated by casting PbL ⁇ onto a SrTiCh-coated GGO substrate.
  • the PbL ⁇ may be converted to MAPbL ⁇ by a dipping process. This process is described in greater detail below. This resulting conversion of PbL ⁇ to MAPbL ⁇ is more complete (as observed by optical spectroscopy) as compared to the preparation of the substrate without SrTiO 3 ,
  • any interfacial material discussed herein may further comprise doped compositions.
  • a stoichiometric or non-stoichiometric material may be doped with one or more elements (e.g., Na, Y, Mg, N, P) in amounts ranging from as little as 1 ppb to 50 mol%.
  • elements e.g., Na, Y, Mg, N, P
  • interfacial materials include: NiO, TiCh, SrTiO 3 , Al 2 O 3 , ZrO 3 , WO3, V2O5, MO3, ZnO, graphene, and carbon black.
  • Examples of possible dopants for these interfacial materials include: Li, Na, Be, Mg, Ca, Sr, Ba, Sc, Y, Nb, Ti, Fe, Co, Ni, Cu, Ga, Sn, In, B, N, P, C, S, As, a halide, a pseudohalide (e.g., cyanide, cyanate, isocyanate, fulminate, thiocyanate, isothiocyanate, azide, tetracarbonylcobaltate, carbamoyldicyanomethanide, dicyanonitrosomethanide, dicyanamide, and tricyanomethanide), and A1 in any of its oxidation states.
  • References herein to doped interfacial materials are not intended to limit the ratios of component elements in interfacial material compounds.
  • multiple IFLs made from different materials may be arranged adjacent to each other to form a composite IFL.
  • This configuration may involve two different IFLs, three different IFLs, or an even greater number of different IFLs.
  • the resulting multi-layer IFL or composite IFL may be used in lieu of a single-material IFL.
  • a composite IFL may be used any IFL shown in the example of FIG. 2, such as IFL 3903, IFL 3905, IFL 3907, IFL 3909, or IFL 3911. While the composite IFL differs from a single-material IFL, the assembly of a perovskite material PV cell having multi-layer IFLs is not substantially different than the assembly of a perovskite material PV cell having only single-material IFLs.
  • the composite IFL may be made using any of the materials discussed herein as suitable for an IFL.
  • the IFL comprises a layer of AI2O3 and a layer of ZnO or M:ZnO (doped ZnO, e.g., Be:ZnO, Mg:ZnO, Ca:ZnO, Sr:ZnO, Ba:ZnO, Sc:ZnO, Y:ZnO, Nb:ZnO).
  • the IFL comprises a layer of ZrO 3 and a layer of ZnO or M:ZnO.
  • the IFL comprises multiple layers.
  • a multi-layer IFL generally has a conductor layer, a dielectric layer, and a semi-conductor layer.
  • the layers may repeat, for example, a conductor layer, a dielectric layer, a semi-conductor layer, a dielectric layer, and a semi-conductor layer.
  • multi-layer IFLs include an IFL having an GGO layer, an AI2O3 layer, a ZnO layer, and a second AI2O3 layer; an IFL having an GGO layer, an AI2O3 layer, a ZnO layer, a second AI2O3 layer, and a second ZnO layer; an IFL having an GGO layer, an AI2O3 layer, a ZnO layer, a second AI2O3 layer, a second ZnO layer, and a third AI2O3 layer; and IFLs having as many layers as necessary to achieve the desired performance characteristics.
  • references to certain stoichiometric ratios are not intended to limit the ratios of component elements in IFL layers according to various embodiments.
  • Arranging two or more adjacent IFLs as a composite IFL may outperform a single IFL in perovskite material PV cells where attributes from each IFL material may be leveraged in a single IFL.
  • GGO is a conducting electrode
  • AI2O3 is a dielectric material
  • ZnO is a n-type semiconductor
  • ZnO acts as an electron acceptor with well performing electron transport properties (e.g., mobility).
  • AI2O3 is a physically robust material that adheres well to GGO, homogenizes the surface by capping surface defects (e.g., charge traps), and improves device diode characteristics through suppression of dark current.
  • some perovskite material PV cells may include so called“tandem” PV cells having more than one perovskite photoactive layer.
  • both photoactive materials 3908 and 3906 of FIG. 2 may be perovskite materials.
  • an interfacial layer between the two photoactive layers, such as IFL 3907 of FIG. 2 may comprise a multi-layer, or composite, IFL.
  • the layers sandwiched between the two photoactive layers of a tandem PV device may include an electrode layer.
  • a tandem PV device may include the following layers, listed in order from either top to bottom or bottom to top: a first substrate, a first electrode, a first interfacial layer, a first perovskite material, a second interfacial layer, a second electrode, a third interfacial layer, a second perovskite material, a fourth interfacial layer, and a third electrode.
  • the first and third interfacial layers may be hole transporting interfacial layers and the second and fourth interfacial layers may be electron transporting interfacial layers.
  • the first and third interfacial layers may be electron transporting interfacial layers and the second and fourth interfacial layers may be hole transporting interfacial layers.
  • the first and fourth interfacial layers may be hole transporting interfacial layers and the second and third interfacial layers may be electron transporting interfacial layers.
  • the first and fourth interfacial layers may be electron transporting interfacial layers and the second and third interfacial layers may be hole transporting interfacial layers.
  • the first and second perovskite materials may have different band gaps.
  • the first perovskite material may be formamidinium lead bromide (FAPbBrs) and the second perovskite material may be formamidinium lead iodide (FAPbL ⁇ ).
  • the first perovskite material may be methylammonium lead bromide (MAPbBrs) and the second perovskite material may be formamidinium lead iodide (FaPbL ⁇ ).
  • the first perovskite material may be methylammonium lead bromide (MAPbBrs) and the second perovskite material may be methylammonium lead iodide (MAPbL ⁇ ).
  • a perovskite material may be incorporated into one or more aspects of a PV or other device.
  • a perovskite material according to some embodiments may be of the general formula CwMyXz, where: C comprises one or more cations (e.g., an amine, ammonium, phosphonium a Group 1 metal, a Group 2 metal, and/or other cations or cation-like compounds); M comprises one or more metals (examples including Be, Mg, Ca, Sr, Ba, Fe, Cd, Co, Ni, Cu, Ag, Au, Hg, Sn, Ge, Ga, Pb, In, Tl, Sb, Bi, Ti, Zn, Cd, Hg, and Zr ); X comprises one or more anions; and w, y, and z represent real numbers between 1 and 20.
  • C may include one or more organic cations.
  • each organic cation C may be larger than each metal M, and each anion X may be capable of bonding with both a cation C and a metal M.
  • a perovskite material may be of the formula CMX3.
  • C may include an ammonium, an organic cation of the general formula [NR4] 1 where the R groups may be the same or different groups.
  • C may include a formamidinium, an organic cation of the general formula [R2NCRNR2] 1 where the R groups may be the same or different groups.
  • Formula 1 illustrates the structure of a formamidinium cation having the general formula of [R2NCRNR2] 1 as described above.
  • Formula 2 illustrates examples structures of several formamidinium cations that may serve as a cation“C” in a perovskite material.
  • Formula 4 illustrates examples of structures of several guanidinium cations that may serve as a cation“C” in a perovskite material.
  • Formula 6 illustrates examples of structures of several ethene tetramine ions that may serve as a cation“C” in a perovskite material.
  • C may include an imidazolium cation, an aromatic, cyclic organic cation of the general formula [CRNRCRNRCR] 1 where the R groups may be the same or different groups.
  • X may include one or more halides
  • X may instead or in addition include a Group 16 anion.
  • the Group 16 anion may be oxide, sulfide, selenide, or telluride.
  • X may instead or in addition include one or more a pseudohalides (e.g., cyanide, cyanate, isocyanate, fulminate, thiocyanate, isothiocyanate, azide, tetracarbonylcobaltate, carbamoyldicyanomethanide, dicyanonitrosomethanide, dicyan amide, and tricyanomethanide).
  • a pseudohalides e.g., cyanide, cyanate, isocyanate, fulminate, thiocyanate, isothiocyanate, azide, tetracarbonylcobaltate, carbamoyldicyanomethanide, dicyanonitrosomethanide, dicyan amide, and tricyanomethanide.
  • a perovskite material may comprise the empirical formula CMXs where: C comprises one or more of the aforementioned cations, a Group 1 metal, a Group 2 metal, and/or other cations or cation-like compounds; M comprises one or more metals (examples including Be, Mg, Ca, Sr, Ba, Fe, Cd, Co, Ni, Cu, Ag, Au, Hg, Sn, Ge, Ga, Pb, In, Tl, Sb, Bi, Ti, Zn, Cd, Hg, and Zr); and X comprises one or more of the aforementioned anions.
  • C comprises one or more of the aforementioned cations, a Group 1 metal, a Group 2 metal, and/or other cations or cation-like compounds
  • M comprises one or more metals (examples including Be, Mg, Ca, Sr, Ba, Fe, Cd, Co, Ni, Cu, Ag, Au, Hg, Sn, Ge, Ga, Pb, In, Tl
  • a perovskite material may comprise the empirical formula CM2X6 where: C’ comprises a cation with a 2+ charge including one or more of the aforementioned cations, diammonium butane, a Group 1 metal, a Group 2 metal, and/or other cations or cation-like compounds; M comprises one or more metals (examples including Be, Mg, Ca, Sr, Ba, Fe, Cd, Co, Ni, Cu, Ag, Au, Hg, Sn, Ge, Ga, Pb, In, Tl, Sb, Bi, Ti, Zn, Cd, Hg, and Zr); and X comprises one or more of the aforementioned anions.
  • C comprises a cation with a 2+ charge including one or more of the aforementioned cations, diammonium butane, a Group 1 metal, a Group 2 metal, and/or other cations or cation-like compounds
  • M comprises one or more metals (examples including Be,
  • a perovskite material may comprise the empirical formula C’MXt where: C’ comprises a cation with a 2+ charge including one or more of the aforementioned cations, di ammonium butane, a Group 1 metal, a Group 2 metal, and/or other cations or cationlike compounds; M comprises one or more metals (examples including Be, Mg, Ca, Sr, Ba, Fe, Cd, Co, Ni, Cu, Ag, Au, Hg, Sn, Ge, Ga, Pb, In, Tl, Sb, Bi, Ti, Zn, Cd, Hg, and Zr); and X comprises one or more of the aforementioned anions.
  • the perovskite material may have a 2D structure.
  • a perovskite material may comprise the empirical formula C 3 M 2 X 9 where: C comprises one or more of the aforementioned cations, a Group 1 metal, a Group 2 metal, and/or other cations or cation-like compounds; M comprises one or more metals (examples including Be, Mg, Ca, Sr, Ba, Fe, Cd, Co, Ni, Cu, Ag, Au, Hg, Sn, Ge, Ga, Pb, In, Tl, Sb, Bi, Ti, Zn, Cd, Hg, and Zr); and X comprises one or more of the aforementioned anions.
  • a perovskite material may comprise the empirical formula CM2X7 where: C comprises one or more of the aforementioned cations, a Group 1 metal, a Group 2 metal, and/or other cations or cation-like compounds; M comprises one or more metals (examples including Be, Mg, Ca, Sr, Ba, Fe, Cd, Co, Ni, Cu, Ag, Au, Hg, Sn, Ge, Ga, Pb, In, Tl, Sb, Bi, Ti, Zn, Cd, Hg, and Zr n); and X comprises one or more of the aforementioned anions.
  • C comprises one or more of the aforementioned cations, a Group 1 metal, a Group 2 metal, and/or other cations or cation-like compounds
  • M comprises one or more metals (examples including Be, Mg, Ca, Sr, Ba, Fe, Cd, Co, Ni, Cu, Ag, Au, Hg, Sn, Ge, Ga, Pb, In
  • a perovskite material may comprise the empirical formula C 2 MX 4 where: C comprises one or more of the aforementioned cations, a Group 1 metal, a Group 2 metal, and/or other cations or cation-like compounds; M comprises one or more metals (examples including Be, Mg, Ca, Sr, Ba, Fe, Cd, Co, Ni, Cu, Ag, Au, Hg, Sn, Ge, Ga, Pb, In, Tl, Sb, Bi, Ti, Zn, Cd, Hg, and Zr); and X comprises one or more of the aforementioned anions.
  • C comprises one or more of the aforementioned cations, a Group 1 metal, a Group 2 metal, and/or other cations or cation-like compounds
  • M comprises one or more metals (examples including Be, Mg, Ca, Sr, Ba, Fe, Cd, Co, Ni, Cu, Ag, Au, Hg, Sn, Ge, Ga, Pb, In, T
  • Perovskite materials may also comprise mixed ion formulations where C, M, or X comprise two or more species, for example,
  • the present disclosure may provide composite design of PV and other similar devices (e.g., batteries, hybrid PV batteries, FETs, LEDs, nonlinear optics (NLO 3 ), waveguides, etc.) including one or more perovskite materials.
  • one or more perovskite materials may serve as either or both of first and second active material of some embodiments (e.g., active materials 3906a and 3908a of FIG. 3).
  • some embodiments of the present disclosure provide PV or other devices having an active layer comprising one or more perovskite materials.
  • perovskite material that is, material including any one or more perovskite materials(s)
  • perovskite material may be employed in active layers of various architectures.
  • perovskite material may serve the function(s) of any one or more components of an active layer (e.g., charge transport material, mesoporous material, photoactive material, and/or interfacial material, each of which is discussed in greater detail below).
  • the same perovskite materials may serve multiple such functions, although in other embodiments, a plurality of perovskite materials may be included in a device, each perovskite material serving one or more such functions.
  • perovskite material may be prepared and/or present in a device in various states. For example, it may be substantially solid in some embodiments.
  • a solution or suspension may be coated or otherwise deposited within a device (e.g., on another component of the device such as a mesoporous, interfacial, charge transport, photoactive, or other layer, and/or on an electrode).
  • Perovskite materials in some embodiments may be formed in situ on a surface of another component of a device (e.g., by vapor deposition as a thin-film solid). Any other suitable means of forming a layer comprising perovskite material may be employed.
  • a perovskite material device may include a first electrode, a second electrode, and an active layer comprising a perovskite material, the active layer disposed at least partially between the first and second electrodes.
  • the first electrode may be one of an anode and a cathode
  • the second electrode may be the other of an anode and cathode.
  • An active layer may include any one or more active layer components, including any one or more of: charge transport material; liquid electrolyte; mesoporous material; photoactive material (e.g., a dye, silicon, cadmium telluride, cadmium sulfide, cadmium selenide, copper indium gallium selenide, gallium arsenide, germanium indium phosphide, semiconducting polymers, other photoactive materials)); and interfacial material. Any one or more of these active layer components may include one or more perovskite materials. In some embodiments, some or all of the active layer components may be in whole or in part arranged in sub-layers.
  • the active layer may comprise any one or more of: an interfacial layer including interfacial material; a mesoporous layer including mesoporous material; and a charge transport layer including charge transport material.
  • an interfacial layer may be included between any two or more other layers of an active layer according to some embodiments and/or between an active layer component and an electrode.
  • Reference to layers herein may include either a final arrangement (e.g., substantially discrete portions of each material separately definable within the device), and/or reference to a layer may mean arrangement during construction of a device, notwithstanding the possibility of subsequent intermixing of material(s) in each layer.
  • Layers may in some embodiments be discrete and comprise substantially contiguous material (e.g., layers may be as stylistically illustrated in FIG. 2).
  • a perovskite material device may be a field effect transistor (FET).
  • FET field effect transistor
  • An FET perovskite material device may include a source electrode, drain electrode, gate electrode, dielectric layer, and a semiconductor layer.
  • the semiconductor layer of an FET perovskite material device may be a perovskite material.
  • a perovskite material device may optionally include one or more substrates.
  • either or both of the first and second electrode may be coated or otherwise disposed upon a substrate, such that the electrode is disposed substantially between a substrate and the active layer.
  • the materials of composition of devices e.g., substrate, electrode, active layer and/or active layer components
  • an electrode may act as a substrate, thereby negating the need for a separate substrate.
  • a perovskite material device may optionally include an anti-reflective layer or anti-reflective coating (ARC).
  • ARC anti-reflective coating
  • a perovskite material device may include any one or more additives, such as any one or more of the additives discussed above with respect to some embodiments of the present disclosure.
  • FIG. 2 is a stylized diagram of a perovskite material device 3900 according to some embodiments. Although various components of the device 3900 are illustrated as discrete layers comprising contiguous material, it should be understood that FIG. 2 is a stylized diagram; thus, embodiments in accordance with it may include such discrete layers, and/or substantially intermixed, non-contiguous layers, consistent with the usage of “layers” previously discussed herein.
  • the device 3900 includes first and second substrates 3901 and 3913.
  • a first electrode 3902 is disposed upon an inner surface of the first substrate 3901, and a second electrode 3912 is disposed on an inner surface of the second substrate 3913.
  • An active layer 3950 is sandwiched between the two electrodes 3902 and 3912.
  • the active layer 3950 includes a mesoporous layer 3904; first and second photoactive materials 3906 and 3908; a charge transport layer 3910, and several interfacial layers.
  • FIG. 2 furthermore illustrates an example device 3900 according to embodiments wherein sub-layers of the active layer 3950 are separated by the interfacial layers, and further wherein interfacial layers are disposed upon each electrode 3902 and 3912.
  • second, third, and fourth interfacial layers 3905, 3907, and 3909 are respectively disposed between each of the mesoporous layer 3904, first photoactive material 3906, second photoactive material 3908, and charge transport layer 3910.
  • First and fifth interfacial layers 3903 and 3911 are respectively disposed between (i) the first electrode 3902 and mesoporous layer 3904; and (ii) the charge transport layer 3910 and second electrode 3912.
  • the architecture of the example device depicted in FIG. 2 may be characterized as: substrati electrode— active layer— electrode— substrate.
  • interfacial layer mesoporous layer— interfacial layer— photoactive material— interfacial layer— photoactive material— interfacial layer— charge transport layer— interfacial layer.
  • interfacial layers need not be present; or, one or more interfacial layers may be included only between certain, but not all, components of an active layer and/or components of a device.
  • a substrate such as either or both of first and second substrates 3901 and 3913, may be flexible or rigid. If two substrates are included, at least one should be transparent or translucent to electromagnetic (EM) radiation (such as, e.g., UV, visible, or IR radiation). If one substrate is included, it may be similarly transparent or translucent, although it need not be, so long as a portion of the device permits EM radiation to contact the active layer 3950.
  • EM electromagnetic
  • Suitable substrate materials include any one or more of: glass; sapphire; magnesium oxide (MgO); mica; polymers (e.g., PEN, PET, PEG, polyolefin, polypropylene, polyethylene, polycarbonate, PMMA, polyamide, vinyl Kapton, etc.); ceramics; carbon; composites (e.g., fiberglass, Kevlar; carbon fiber); fabrics (e.g., cotton, nylon, silk, wool); wood; drywall; tiles (e.g. ceramic, composite, or clay); metal; steel; silver; gold; aluminum; magnesium; concrete; and combinations thereof.
  • MgO magnesium oxide
  • mica e.g., PEN, PET, PEG, polyolefin, polypropylene, polyethylene, polycarbonate, PMMA, polyamide, vinyl Kapton, etc.
  • ceramics e.g., carbon fiber
  • fabrics e.g., cotton, nylon, silk, wool
  • wood drywall
  • tiles e.g. ceramic, composite, or clay
  • an electrode may be either an anode or a cathode.
  • one electrode may function as a cathode, and the other may function as an anode.
  • Either or both electrodes 3902 and 3912 may be coupled to leads, cables, wires, or other means enabling charge transport to and/or from the device 3900.
  • An electrode may constitute any conductive material, and at least one electrode should be transparent or translucent to EM radiation, and/or be arranged in a manner that allows EM radiation to contact at least a portion of the active layer 3950.
  • Suitable electrode materials may include any one or more of: indium tin oxide or tin-doped indium oxide (ITO); fluorine-doped tin oxide (FTO); cadmium oxide (CdO); zinc indium tin oxide (ZITO); aluminum zinc oxide (AZO); aluminum (Al); gold (Au); silver (Ag); calcium (Ca); chromium (Cr); magnesium (Mg); titanium (Ti); steel; carbon (and allotropes thereof); doped carbon (e.g., nitrogen-doped); nanoparticles in core-shell configurations (e.g., silicon-carbon core-shell structure); and combinations thereof.
  • Mesoporous material may include any pore-containing material.
  • the pores may have diameters ranging from about 1 to about 100 nm; in other embodiments, pore diameter may range from about 2 to about 50 nm.
  • Suitable mesoporous material includes any one or more of: any interfacial material and/or mesoporous material discussed elsewhere herein; aluminum (Al); bismuth (Bi); cerium (Ce); hafnium (Hf); indium (In); molybdenum (Mo); niobium (Nb); nickel (Ni); silicon (Si); titanium (Ti); vanadium (V); zinc (Zn); zirconium (Zr); an oxide of any one or more of the foregoing metals (e.g., alumina, ceria, titania, zinc oxide, zirconia, etc.); a sulfide of any one or more of the foregoing metals; a nitride of any one or more of the foregoing metals; and combinations thereof.
  • aluminum Al
  • any material disclosed herein as an IFL may be a mesoporous material.
  • the device illustrated by FIG. 2 may not include a mesoporous material layer and include only thin-film, or“compact,” IFLs that are not mesoporous.
  • Photoactive material may comprise any photoactive compound, such as any one or more of silicon (for example, polycrystalline silicon, single-crystalline silicon, or amorphous silicon), cadmium telluride, cadmium sulfide, cadmium selenide, copper indium gallium selenide, copper indium selenide, copper zinc tin sulfide, gallium arsenide, germanium, germanium indium phosphide, indium phosphide, one or more semiconducting polymers (e.g., polythiophenes (e.g., poly(3- hexylthiophene) and derivatives thereof, or P3HT); carb azole-based copolymers such as polyheptadecanylcarbazole dithienylbenzothiadiazole and derivatives thereof (e.g., PCDTBT); other copolymers such as polycyclopent
  • silicon for example, polycrystalline silicon, single-crystalline silicon, or amorphous silicon
  • photoactive material may instead or in addition comprise a dye (e.g., N719, N3, other ruthenium-based dyes).
  • a dye (of whatever composition) may be coated onto another layer (e.g., a mesoporous layer and/or an interfacial layer).
  • photoactive material may include one or more perovskite materials.
  • Perovskite-material-containing photoactive substance may be of a solid form, or in some embodiments it may take the form of a dye that includes a suspension or solution comprising perovskite material. Such a solution or suspension may be coated onto other device components in a manner similar to other dyes.
  • solid perovskite-containing material may be deposited by any suitable means (e.g., vapor deposition, solution deposition, direct placement of solid material, etc.).
  • Devices according to various embodiments may include one, two, three, or more photoactive compounds (e.g., one, two, three, or more perovskite materials, dyes, or combinations thereof).
  • each of the two or more dyes or other photoactive materials may be separated by one or more interfacial layers.
  • multiple dyes and/or photoactive compounds may be at least in part intermixed.
  • Charge transport material may include solid-state charge transport material (i.e., a colloquially labeled solid- state electrolyte), or it may include a liquid electrolyte and/or ionic liquid. Any of the liquid electrolyte, ionic liquid, and solid-state charge transport material may be referred to as charge transport material.
  • charge transport material refers to any material, solid, liquid, or otherwise, capable of collecting charge carriers and/or transporting charge carriers. For instance, in PV devices according to some embodiments, a charge transport material may be capable of transporting charge carriers to an electrode.
  • Charge carriers may include holes (the transport of which could make the charge transport material just as properly labeled“hole transport material”) and electrons. Holes may be transported toward an anode, and electrons toward a cathode, depending upon placement of the charge transport material in relation to either a cathode or anode in a PV or other device.
  • Suitable examples of charge transport material may include any one or more of: perovskite material; G/I3 ' ; Co complexes; polythiophenes (e.g., poly(3-hexylthiophene) and derivatives thereof, or P3HT); carbazole-based copolymers such as polyheptadecanylcarbazole dithienylbenzothiadiazole and derivatives thereof (e.g., PCDTBT); other copolymers such as polycyclopentadithiophene— benzothiadiazole and derivatives thereof (e.g., PCPDTBT), polybenzodithiophenyl-thienothiophenediyl and derivatives thereof (e.g., PTB6, PTB7, PTB7-th, PCE-10); poly(triaryl amine) compounds and derivatives thereof (e.g., PTAA); Spiro-OMeTAD; polyphenylene vinylenes and derivatives thereof (
  • charge transport material may include any material, solid or liquid, capable of collecting charge carriers (electrons or holes), and/or capable of transporting charge carriers.
  • Charge transport material of some embodiments therefore may be n- or /7-type active, ambipolar, and/or intrinsic semi-conducting material.
  • Charge transport material may be disposed proximate to one of the electrodes of a device. It may in some embodiments be disposed adjacent to an electrode, although in other embodiments an interfacial layer may be disposed between the charge transport material and an electrode (as shown, e.g., in FIG. 2 with the fifth interfacial layer 3911).
  • the type of charge transport material may be selected based upon the electrode to which it is proximate.
  • the charge transport material may be proximate to an anode so as to transport holes to the anode.
  • the charge transport material may instead be placed proximate to a cathode and be selected or constructed so as to transport electrons to the cathode.
  • devices according to various embodiments may optionally include an interfacial layer between any two other layers and/or materials, although devices according to some embodiments need not contain any interfacial layers.
  • a perovskite material device may contain zero, one, two, three, four, five, or more interfacial layers (such as the example device of FIG. 2, which contains five interfacial layers 3903, 3905, 3907, 3909, and 3911).
  • An interfacial layer may include a thin-coat interfacial layer in accordance with embodiments previously discussed herein (e.g., comprising alumina and/or other metal-oxide particles, and/or a ti tania/metal-oxide bilayer, and/or other compounds in accordance with thin- coat interfacial layers as discussed elsewhere herein).
  • An interfacial layer may include any suitable material for enhancing charge transport and/or collection between two layers or materials; it may also help prevent or reduce the likelihood of charge recombination once a charge has been transported away from one of the materials adjacent to the interfacial layer.
  • Suitable interfacial materials may include any one or more of: any mesoporous material and/or interfacial material discussed elsewhere herein; Ag; Al; Au; B; Bi; Ca; Cd; Ce; Co; Cu; Fe; Ga; Ge; H; In; Mg; Mn; Mo; Nb; Ni; Pt; Sb; Sc; Si; Sn; Ta; Ti; V; W; Y; Zn; Zr; carbides of any of the foregoing metals (e.g., SiC, FesC; WC); silicides of any of the foregoing metals (e.g., Mg2Si, SrSh, Sn2Si); oxides of any of the foregoing metals (e.g., alumina, silica, titania, Sn0 2 , ZnO); sulfides of any of the foregoing metals (e.g., CdS, M0S2, SnS2); nitrides of any of the for
  • an interfacial layer may include perovskite material.
  • interfacial layers may comprise doped embodiments of any interfacial material mentioned herein (e.g., Y-doped ZnO, N-doped single-wall carbon nanotubes).
  • Interfacial layers may also comprise a compound having three of the above materials (e.g., CuTiO 3 , ZmSnCfo) or a compound having four of the above materials (e.g., CoNiZnO).
  • FIG. 3 illustrates an embodiment of a perovskite material device 3900a having a similar structure to perovskite material device 3900 illustrated by FIG. 2.
  • FIG. 3 is a stylized diagram of a perovskite material device 3900a according to some embodiments. Although various components of the device 3900a are illustrated as discrete layers comprising contiguous material, it should be understood that FIG. 3 is a stylized diagram; thus, embodiments in accordance with it may include such discrete layers, and/or substantially intermixed, noncontiguous layers, consistent with the usage of“layers” previously discussed herein.
  • FIG. 3 includes an active layers 3906a and 3908a.
  • active layers 3906a and 3908a may, in some embodiments, include any perovskite photoactive materials described above with respect to FIG. 2.
  • one or both of active layers 3906a and 3908a may include any photoactive material described herein, such as, thin film semiconductors (e.g., CdTe, CZTS, CIGS), photoactive polymers, dye sensitized photoactive materials, fullerenes, small molecule photoactive materials, and crystalline and polycrystalline semiconductor materials (e.g., silicon, GaAs, InP, Ge).
  • one or both of active layers 3906a and 3908a may include a light emitting diode (LED), field effect transistor (FET), thin film battery layer, or combinations thereof.
  • LED light emitting diode
  • FET field effect transistor
  • one of active layers 3906a and 3908a may include a photoactive material and the other may include a light emitting diode (LED), field effect transistor (FET), thin film battery layer, or combinations thereof.
  • active layer 3908a may comprise a perovskite material photoactive layer and active layer 3906b may comprise a field effect transistor layer.
  • Other layers illustrated of FIG. 3, such as layers 3901a, 3902a, 3903a, 3904a, 3905a, 3907a, 3909a, 3910a, 3911a, 3912a, and 3913a, may be analogous to such corresponding layers as described herein with respect to FIG. 2.
  • a perovskite material may have three or more active layers.
  • FIG. 4 illustrates an embodiment of a perovskite material device 3900b having a similar structure to perovskite material device 3900 illustrated by FIG. 2.
  • FIG. 3 is a stylized diagram of a perovskite material device 3900b according to some embodiments. Although various components of the device 3900b are illustrated as discrete layers comprising contiguous material, it should be understood that FIG. 4 is a stylized diagram; thus, embodiments in accordance with it may include such discrete layers, and/or substantially intermixed, noncontiguous layers, consistent with the usage of“layers” previously discussed herein.
  • FIG. 4 is a stylized diagram; thus, embodiments in accordance with it may include such discrete layers, and/or substantially intermixed, noncontiguous layers, consistent with the usage of“layers” previously discussed herein.
  • active layers 3904b, 3906b and 3908b may, in some embodiments, include any perovskite photoactive materials described above with respect to FIG. 2.
  • active layers 3904b, 3906b and 3908b may include any photoactive material described herein, such as, thin film semiconductors (e.g., CdTe, CZTS, CIGS), photoactive polymers, dye sensitized photoactive materials, fullerenes, small molecule photoactive materials, and crystalline and polycrystalline semiconductor materials (e.g., silicon, GaAs, InP, Ge).
  • one or more of active layers 3904b, 3906b and 3908b may include a light emitting diode (LED), field effect transistor (FET), thin film battery layer, or combinations thereof.
  • one or more of active layers of active layers 3904b, 3906b and 3908b may include a photoactive material and the other may include a light emitting diode (LED), field effect transistor (FET), thin film battery layer, or combinations thereof.
  • active layer 3908a and 3906b may both comprise perovskite material photoactive layers and active layer 3904b may comprise a field effect transistor layer.
  • layers 3901b, 3902b, 3903b, 3904b, 3905b, 3907b, 3909b, 3910b, 3911b, 3912b, and 3913b may be analogous to such corresponding layers as described herein with respect to FIG. 2.
  • FIGs. 1-4 similarly is not intended to restrict the type of device which may in some embodiments be constructed in accordance with any one or more of FIGs. 1-4. That is, the architectures exhibited in FIGs. 1-4 may be adapted so as to provide the BHJs, batteries, FETs, hybrid PV batteries, serial multi-cell PVs, parallel multi-cell PVs and other similar devices of other embodiments of the present disclosure, in accordance with any suitable means (including both those expressly discussed elsewhere herein, and other suitable means, which will be apparent to those skilled in the art with the benefit of this disclosure).
  • a perovskite material in the active layer may have the formulation CMXg-yX'y (0 > y > 3), where: C comprises one or more cations (e.g., an amine, ammonium, a Group 1 metal, a Group 2 metal, formamidinium, guanidinium, ethene tetramine, phosphonium, imidazolium, and/or other cations or cation-like compounds); M comprises one or more metals (e.g., Be, Mg, Ca, Sr, Ba, Fe, Cd, Co, Ni, Cu, Ag, Au, Hg, Sn, Ge, Ga, Pb, In, Tl, Sb, Bi, Ti, Zn, Cd, Hg, and Zr ); and X comprise one or more anions.
  • C comprises one or more cations (e.g., an amine, ammonium, a Group 1 metal, a Group 2 metal, formamidinium, guanidinium, e
  • the perovskite material may comprise CPbE-yCly.
  • the perovskite material may be deposited as an active layer in a PV device by, for example, drop casting, spin casting, slot-die printing, screen printing, or ink-jet printing onto a substrate layer using the steps described below.
  • a lead halide precursor ink is formed.
  • An amount of lead halide may be massed in a clean, dry vessel in a controlled atmosphere environment (e.g., a controlled atmosphere box with glove-containing portholes allows for materials manipulation in an air-free environment).
  • Suitable lead halides include, but are not limited to, lead (P) iodide, lead (P) bromide, lead (P) chloride, and lead (P) fluoride.
  • the lead halide may comprise a single species of lead halide or it may comprise a lead halide mixture in a precise ratio.
  • the lead halide mixture may comprise any binary, ternary, or quaternary ratio of 0.001-100 mol% of iodide, bromide, chloride, or fluoride.
  • the lead halide mixture may comprise lead (P) chloride and lead (P) iodide in a ratio of about 10:90 mol:mol.
  • the lead halide mixture may comprise lead (P) chloride and lead (II) iodide in a ratio of about 5:95, about 7.5:92.5, or about 15:85 mol:mol.
  • Suitable precursor salts may comprise any combination of lead (P) or lead(IV) and the following anions: nitrate, nitrite, carboxylate, acetate, acetonyl acetonate, formate, oxalate, sulfate, sulfite, thiosulfate, phosphate, tetrafluoroborate, hexafluorophosphate, tetra(perfluorophenyl) borate, hydride, oxide, peroxide, hydroxide, nitride, arsenate, arsenite, perchlorate, carbonate, bicarbonate, chromate, dichromate, iodate, bromate, chlorate, chlorite, hypochlorite, hypobromite, cyanide, cyanate, isocyanate, fulminate, thio
  • the precursor ink may further comprise a lead (P) or lead (IV) salt in mole ratios of 0 to 100% to the following metal ions Be, Mg, Ca, Sr, Ba, Fe, Cd, Co, Ni, Cu, Ag, Au, Hg, Sn, Ge, Ga, Pb, In, Tl, Sb, Bi, Ti, Zn, Cd, Hg, and Zr as a salt of the aforementioned anions.
  • a lead (P) or lead (IV) salt in mole ratios of 0 to 100% to the following metal ions Be, Mg, Ca, Sr, Ba, Fe, Cd, Co, Ni, Cu, Ag, Au, Hg, Sn, Ge, Ga, Pb, In, Tl, Sb, Bi, Ti, Zn, Cd, Hg, and Zr as a salt of the aforementioned anions.
  • a solvent may then be added to the vessel to dissolve the lead solids to form the lead halide precursor ink.
  • Suitable solvents include, but are not limited to, dry N-cyclohexyl-2- pyrrolidone, alkyl-2-pyrrolidone, dimethylformamide, dialkylformamide, dimethylsulfoxide (DMSO), methanol, ethanol, propanol, butanol, tetrahydrofuran, formamide, tert-butylpyridine, pyridine, alkylpyridine, pyrrolidine, chlorobenzene, dichlorobenzene, dichloromethane, chloroform, and combinations thereof.
  • the lead solids are dissolved in dry dimethylformamide (DMF).
  • the lead solids may be dissolved at a temperature between about 20°C to about 150°C. In one embodiment, the lead solids are dissolved at about 85°C.
  • the lead solids may be dissolved for as long as necessary to form a solution, which may take place over a time period up to about 72 hours.
  • the resulting solution forms the base of the lead halide precursor ink.
  • the lead halide precursor ink may have a lead halide concentration between about 0.001M and about 10M. In one embodiment, the lead halide precursor ink has a lead halide concentration of about 1 M.
  • the lead halide precursor ink may further comprise an amino acid (e.g., 5-aminovaleric acid, histidine, glycine, lysine), an amino acid hydrohalide (e.g., 5-amino valeric acid hydrochloride), an IFL surface-modifying (SAM) agent (such as those discussed earlier in the specification), or a combination thereof.
  • an amino acid e.g., 5-aminovaleric acid, histidine, glycine, lysine
  • an amino acid hydrohalide e.g., 5-amino valeric acid hydrochloride
  • SAM IFL surface-modifying
  • formamidinium chloride may be added to the lead halide precursor ink.
  • the halide of any cation discussed earlier in the specification may be used.
  • combinations of additives may be added to the lead halide precursor ink including, for example, the combination of formamidinium chloride and 5-amino valeric acid hydrochloride.
  • the two-step perovskite thin film deposition process may be improved by adding formamidinium chloride and/or 5-amino valeric acid hydrochloride directly to a lead halide precursor solution (e.g., PbL ⁇ ) to leverage both advantages with a single material.
  • a lead halide precursor solution e.g., PbL ⁇
  • Other perovskite film deposition processes may likewise be improved by the addition of formamidinium chloride, 5-amino valeric acid hydrochloride, or PbCkto a lead halide precursor solution.
  • the additives including formamidinium chloride and/or 5-amino valeric acid hydrochloride may be added to the lead halide precursor ink at various concentrations depending on the desired characteristics of the resulting perovskite material.
  • the additives may be added in a concentration of about 1 nM to about 1 M.
  • the additives may be added in a concentration of about 1 mM to about 1 M.
  • the additives may be added in a concentration of about 1 pM to about 1 mM.
  • water may be added to the lead halide precursor ink.
  • the presence of water affects perovskite thin-film crystalline growth. Under normal circumstances, water may be absorbed as vapor from the air.
  • Suitable water includes distilled, deionized water, or any other source of water that is substantially free of contaminants (including minerals). It has been found, based on light I-V sweeps, that the perovskite PV light-to-power conversion efficiency may nearly triple with the addition of water compared to a completely dry device.
  • the water may be added to the lead halide precursor ink at various concentrations depending on the desired characteristics of the resulting perovskite material.
  • the water may be added in a concentration of about 1 nL/mL to about 1 mL/mL.
  • the water may be added in a concentration of about 1 pL/mL to about 0.1 mL/mL.
  • the water may be added in a concentration of about 1 pL/mL to about 20 pL/mL.
  • the lead halide precursor ink may then be deposited on the desired substrate.
  • Suitable substrate layers may include any of the substrate layers identified earlier in this disclosure.
  • the lead halide precursor ink may be deposited through a variety of means, including but not limited to, drop casting, spin casting, slot-die printing, screen printing, or ink-jet printing.
  • the lead halide precursor ink may be spin-coated onto the substrate at a speed of about 500 rpm to about 10,000 rpm for a time period of about 5 seconds to about 600 seconds.
  • the lead halide precursor ink may be spin-coated onto the substrate at about 3000 rpm for about 30 seconds.
  • the lead halide precursor ink may be deposited on the substrate at an ambient atmosphere in a humidity range of about 0% relative humidity to about 50% relative humidity.
  • the lead halide precursor ink may then be allowed to dry in a substantially water-free atmosphere, i.e., less than 30% relative humidity, to form a thin film.
  • the thin film may then be thermally annealed for a time period up to about 24 hours at a temperature of about 20 °C to about 300 °C. In one embodiment, the thin film may be thermally annealed for about ten minutes at a temperature of about 50 °C.
  • the perovskite material active layer may then be completed by a conversion process in which the precursor film is submerged or rinsed with a solution comprising a solvent or mixture of solvents (e.g., DMF, isopropanol, methanol, ethanol, butanol, chloroform chlorobenzene, dimethyl sulfoxide, water) and salt (e.g., methylammonium iodide, formamidinium iodide, guanidinium iodide, 1,2,2- triaminovinylammonium iodide, 5-aminovaleric add hydroiodide) in a concentration between 0.001M and 10M.
  • the thin films may also be thermally post-annealed in the same fashion as in the first line of this paragraph.
  • a lead salt precursor may be deposited onto a substrate to form a lead salt thin film.
  • the substrate may have a temperature about equal to ambient temperature or have a controlled temperature between 0 °C and 500 °C.
  • the lead salt precursor may be deposited by a variety of methods known in the art, including but not limited to spin- coating, slot-die printing, ink-jet printing, gravure printing, screen printing, sputtering, PE-CVD, thermal evaporation, or spray coating. Deposition of the lead salt precursor may be performed in a variety of atmospheres at ambient pressure (e.g.
  • the deposition atmosphere may comprise ambient air, a controlled humidity environment (e.g., 0 - 100 g H 2 O/m 3 of gas), pure argon, pure nitrogen, pure oxygen, pure hydrogen, pure helium, pure neon, pure krypton, pure CO2 or any combination of the preceding gases.
  • a controlled humidity environment may include an environment in which the absolute humidity or the % relative humidity is held at a fixed value, or in which the absolute humidity or the % relative humidity varies according to predetermined set points or a predetermined function.
  • deposition may occur in a controlled humidity environment having a % relative humidity greater than or equal to 0% and less than or equal to 50%. In other embodiments, deposition may occur in a controlled humidity environment containing greater than or equal to 0 g fH 2 O/m 3 gas and less than or equal to 20 g H 2 O/m 3 gas.
  • the lead salt precursor may be a liquid, a gas, solid, or combination of these states of matter such as a solution, suspension, colloid, foam, gel, or aerosol.
  • the lead salt precursor may be a solution containing one or more solvents.
  • the lead salt precursor may contain one or more of N-cyclohexyl-2-pyrrolidone, alkyl-2-pyrrolidone, dimethylformamide, dialkylformamide, dimethylsulfoxide (DMSO), methanol, ethanol, propanol, butanol, tetrahydrofuran, formamide, tert-butylpyridine, pyridine, alkylpyridine, pyrrolidine, chlorobenzene, dichlorobenzene, dichloromethane, chloroform, and combinations thereof.
  • DMSO dimethylsulfoxide
  • the lead salt precursor may comprise a single lead salt (e.g., lead (P) iodide, lead (P) thiocyanate) or any combination of those disclosed herein (e.g., PbL ⁇ + PbCh ; Pbb + Pb(SCN)2).
  • the lead salt precursor may also contain one or more additives such as an amino acid (e.g., 5-aminovaleric acid hydroiodide), 1,8-diiodooctane, 1,8-dithiooctane, formamidinium halide, acetic acid, trifluoroacetic acid, a methylammonium halide, or water.
  • the lead halide precursor ink may be allowed to dry in a substantially water-free atmosphere, i.e., less than 30% relative humidity, to form a thin film.
  • the thin film may then be thermally annealed for a time period of up to about 24 hours at a temperature of about 20 °C to about 300 °C.
  • Annealing may be performed in a variety of atmospheres at ambient pressure (e.g. about one atmosphere, depending on elevation and atmospheric conditions) or at pressures less than atmospheric or ambient (e.g., 1 mTorr to 500 mTorr).
  • An annealing atmosphere may comprise ambient air, a controlled humidity environment (e.g., 0 - 100 g H 2 O/m 3 of gas), pure argon, pure nitrogen, pure oxygen, pure hydrogen, pure helium, pure neon, pure krypton, pure CO2 or any combination of the preceding gases.
  • a controlled humidity environment may include an environment in which the absolute humidity or the % relative humidity is held at a fixed value, or in which the absolute humidity or the % relative humidity varies according to predetermined set points or a predetermined function.
  • annealing may occur in a controlled humidity environment having a % relative humidity greater than or equal to 0% and less than or equal to 50%.
  • annealing may occur in a controlled humidity environment containing greater than or equal to 0 g IfeO/m 3 gas and less than or equal to 20 g fH 2 O/m 3 gas
  • a second salt precursor e.g., formamidinium iodide, formamidinium thiocyanate, or guanidinium thiocyanate
  • the lead salt thin film may have a temperature about equal to ambient temperature or have a controlled temperature between 0 °C and 500 °C.
  • the second salt precursor in some embodiments, may be deposited at ambient temperature or at elevated temperature between about 25 ° ° and 125 °C.
  • the second salt precursor may be deposited by a variety of methods known in the art, including but not limited to spin-coating, slot-die printing, ink-jet printing, gravure printing, screen printing, sputtering, PE-CVD, thermal evaporation, or spray coating. Deposition of the second salt precursor may be performed in a variety of atmospheres at ambient pressure (e.g. about one atmosphere, depending on elevation and atmospheric conditions) or at pressures less than atmospheric or ambient (e.g., 1 mTorr to 500 mTorr).
  • ambient pressure e.g. about one atmosphere, depending on elevation and atmospheric conditions
  • pressures less than atmospheric or ambient e.g., 1 mTorr to 500 mTorr.
  • the deposition atmosphere may comprise ambient air, a controlled humidity environment (e.g., 0 - 100 g H 2 O/m 3 of gas), pure argon, pure nitrogen, pure oxygen, pure hydrogen, pure helium, pure neon, pure krypton, pure CO2 or any combination of the preceding gases.
  • a controlled humidity environment may include an environment in which the absolute humidity or the % relative humidity is held at a fixed value, or in which the absolute humidity or the % relative humidity varies according to predetermined set points or a predetermined function.
  • deposition may occur in a controlled humidity environment having a % relative humidity greater than or equal to 0% and less than or equal to 50%.
  • deposition may occur in a controlled humidity environment containing greater than or equal to 0 g fH 2 O/m 3 gas and less than or equal to 20 g H 2 O/m 3 gas.
  • the second salt precursor may be a solution containing one or more solvents.
  • the second salt precursor may contain one or more of dry N- cyclohexyl-2-pyrrolidone, alkyl-2-pyrrolidone, dimethylformamide, dialkylformamide, dimethylsulfoxide (DMSO), methanol, ethanol, propanol, butanol, tetrahydrofuran, formamide, tert-butylpyridine, pyridine, alkylpyridine, pyrrolidine, chlorobenzene, dichlorobenzene, dichloromethane, chloroform, and combinations thereof.
  • the substrate may be annealed.
  • Annealing the substrate may convert the lead salt precursor and second salt precursor to a perovskite material, (e.g. FAPbL ⁇ , GAPb(SCN)3, FASnlg).
  • Annealing may be performed in a variety of atmospheres at ambient pressure (e.g. about one atmosphere, depending on elevation and atmospheric conditions) or at pressures less than atmospheric or ambient (e.g., 1 mTorr to 500 mTorr).
  • An annealing atmosphere may comprise ambient air, a controlled humidity environment (e.g., 0 - 100 g H 2 O/m 3 of gas), pure argon, pure nitrogen, pure oxygen, pure hydrogen, pure helium, pure neon, pure krypton, pure CO2 or any combination of the preceding gases.
  • a controlled humidity environment may include an environment in which the absolute humidity or the % relative humidity is held at a fixed value, or in which the absolute humidity or the % relative humidity varies according to predetermined set points or a predetermined function.
  • annealing may occur in a controlled humidity environment having a % relative humidity greater than or equal to 0% and less than or equal to 50%.
  • annealing may occur in a controlled humidity environment containing greater than or equal to 0 g H 2 O/m 3 gas and less than or equal to 20 g H 2 O/m 3 gas. In some embodiments, annealing may occur at a temperature greater than or equal to 50 °C and less than or equal to 300 °C. Unless described as otherwise, any annealing or deposition step described herein may be carried out under the preceding conditions.
  • a FAPblg perovskite material may be formed by the following process.
  • First a lead (P) halide precursor comprising about a 90: 10 mole ratio of Pbb to PbCh dissolved in anhydrous DMF may be deposited onto a substrate by spincoating or slot-die printing.
  • the lead halide precursor ink may be allowed to dry in a substantially water-free atmosphere, i.e., less than 30% relative humidity, for approximately one hour (+ 15 minutes) to form a thin film.
  • the thin film may be subsequently thermally annealed for about ten minutes at a temperature of about 50 °C (+ 10 °C).
  • the lead halide precursor may be deposited by ink-jet printing, gravure printing, screen printing, sputtering, PE-CVD, atomic-layer deposition, thermal evaporation, or spray coating.
  • a formamidinium iodide precursor comprising a 25 - 60 mgZmL concentration of formamidinium iodide dissolved in anhydrous isopropyl alcohol may be deposited onto the lead halide thin film by spin coating or slot-die printing.
  • the formamidinium iodide precursor may be deposited by ink-jet printing, gravure printing, screen printing, sputtering, PE-CVD, atomic-layer deposition, thermal evaporation, or spray coating.
  • the substrate may be annealed at about 25 % relative humidity (about 4 to 7 g H 2 O/m 3 air) and between about 125 °C and 200 °C to form a formamidinium lead iodide (FAPbL ⁇ ) perovskite material.
  • FAPbL ⁇ formamidinium lead iodide
  • a perovskite material may comprise C’CPbXg, where C’ is one or more Group 1 metals (i.e. Li, Na, K, Rb, Cs).
  • C’ is one or more Group 1 metals (i.e. Li, Na, K, Rb, Cs).
  • M’ may be cesium (Cs).
  • C’ may be rubidium (Rb).
  • C’ may be sodium (Na).
  • C’ may be potassium (K).
  • a perovskite material may comprise C’vC w PbyX z , where C’ is one or more Group 1 metals and v, w, y, and z represent real numbers between 1 and 20.
  • the perovskite material may be deposited as an active layer in a PV device by, for example, drop casting, spin casting, gravure coating, blade coating, reverse gravure coating, slot-die printing, screen printing, or ink-jet printing onto a substrate layer using the steps described below.
  • a lead halide solution is formed.
  • An amount of lead halide may be massed in a clean, dry vessel in a controlled atmosphere environment.
  • Suitable lead halides include, but are not limited to, lead (P) iodide, lead (P) bromide, lead (P) chloride, and lead (P) fluoride.
  • the lead halide may comprise a single species of lead halide or it may comprise a lead halide mixture in a precise ratio. In one embodiment the lead halide may comprise lead (P) iodide.
  • the lead halide mixture may comprise any binary, ternary, or quaternary ratio of 0.001-100 mol% of iodide, bromide, chloride, or fluoride.
  • the lead halide mixture may comprise lead (P) chloride and lead (P) iodide in a ratio of about 10:90 mol:mol.
  • the lead halide mixture may comprise lead (II) chloride and lead (II) iodide in a ratio of about 5:95, about 7.5:92.5, or about 15:85 mol:mol.
  • Suitable precursor lead salts may comprise any combination of lead (P) or lead(IV) and the following anions: nitrate, nitrite, carboxylate, acetate, formate, oxalate, sulfate, sulfite, thiosulfate, phosphate, tetrafluoroborate, hexafluorophosphate, tetra(perfluorophenyl) borate, hydride, oxide, peroxide, hydroxide, nitride, arsenate, arsenite, perchlorate, carbonate, bicarbonate, chromate, dichromate, iodate, bromate, chlorate, chlorite, hypochlorite, hypobromite, cyanide, cyanate, isocyanate, fulminate, thiocyanate, isothiocyanate,
  • the lead salt solution may further comprise a lead (P) or lead (IV) salt in mole ratios of 0 to 100% to the following metal ions Be, Mg, Ca, Sr, Ba, Fe, Cd, Co, Ni, Cu, Ag, Au, Hg, Sn, Ge, Ga, Pb, In, Tl, Sb, Bi, Ti, Zn, Cd, Hg, and Zr as a salt of the aforementioned anions.
  • a lead (P) or lead (IV) salt in mole ratios of 0 to 100% to the following metal ions Be, Mg, Ca, Sr, Ba, Fe, Cd, Co, Ni, Cu, Ag, Au, Hg, Sn, Ge, Ga, Pb, In, Tl, Sb, Bi, Ti, Zn, Cd, Hg, and Zr as a salt of the aforementioned anions.
  • a solvent may then be added to the vessel to dissolve the lead halide solids to form the lead halide solution.
  • Suitable solvents include, but are not limited to, dry N-cyclohexyl-2- pyrrolidone, alkyl-2-pyrrolidone, dimethylformamide (DMF), dialkylformamide, dimethylsulfoxide (DMSO), methanol, ethanol, propanol, butanol, tetrahydrofuran, formamide, tert-butylpyridine, pyridine, alkylpyridine, pyrrolidine, chlorobenzene, dichlorobenzene, dichloromethane, chloroform, and combinations thereof.
  • the lead solids are dissolved in dry dimethylformamide (DMF).
  • the lead halide solids may be dissolved at a temperature between about 20°C to about 150°C. In one embodiment, the lead halide solids are dissolved at about 85°C.
  • the lead halide solids may be dissolved for as long as necessary to form a solution, which may take place over a time period up to about 72 hours.
  • the resulting solution forms the base of the lead halide precursor ink.
  • the lead halide precursor ink may have a lead halide concentration between about 0.001M and about 10M. In one embodiment, the lead halide precursor ink has a lead halide concentration of about 1 M.
  • the lead halide solution may further comprise an amino acid (e.g., 5-aminovaleric acid, histidine, glycine, lysine), an amino acid hydrohalide (e.g., 5-amino valeric acid hydrochloride), an IFL surface-modifying (SAM) agent (such as those discussed earlier in the specification), or a combination thereof.
  • an amino acid e.g., 5-aminovaleric acid, histidine, glycine, lysine
  • an amino acid hydrohalide e.g., 5-amino valeric acid hydrochloride
  • SAM IFL surface-modifying
  • a Group 1 metal halide solution is formed.
  • An amount of Group 1 metal halide may be massed in a clean, dry vessel in a controlled atmosphere environment.
  • Suitable Group 1 metal halides include, but are not limited to, cesium iodide, cesium bromide, cesium chloride, cesium fluoride, rubidium iodide, rubidium bromide, rubidium chloride, rubidium fluoride, lithium iodide, lithium bromide, lithium chloride, lithium fluoride, sodium iodide, sodium bromide, sodium chloride, sodium fluoride, potassium iodide, potassium bromide, potassium chloride, potassium fluoride.
  • the Group 1 metal halide may comprise a single species of Group 1 metal halide or it may comprise a Group 1 metal halide mixture in a precise ratio.
  • the Group 1 metal halide may comprise cesium iodide.
  • the Group 1 metal halide may comprise rubidium iodide.
  • the Group 1 metal halide may comprise sodium iodide.
  • the Group 1 metal halide may comprise potassium iodide.
  • Group 1 metal salt precursors may be used in conjunction with or in lieu of Group 1 metal halide salts to form a Group 1 metal salt solution.
  • Suitable precursor Group 1 metal salts may comprise any combination of Group 1 metals and the following anions: nitrate, nitrite, carboxylate, acetate, formate, oxalate, sulfate, sulfite, thiosulfate, phosphate, tetrafluoroborate, hexafluorophosphate, tetra(perfluorophenyl) borate, hydride, oxide, peroxide, hydroxide, nitride, arsenate, arsenite, perchlorate, carbonate, bicarbonate, chromate, dichromate, iodate, bromate, chlorate, chlorite, hypochlorite, hypobromite, cyanide, cyanate, isocyanate, fulminate, thiocyanate, isothio
  • a solvent may then be added to the vessel to dissolve the Group 1 metal halide solids to form the Group 1 metal halide solution.
  • Suitable solvents include, but are not limited to, dry N-cyclohexyl-2-pyrrolidone, alkyl-2-pyrrolidone, dimethylformamide (DMF), dialkylformamide, dimethylsulfoxide (DMSO), methanol, ethanol, propanol, butanol, tetrahydrofuran, formamide, tert-butylpyridine, pyridine, alkylpyridine, pyrrolidine, chlorobenzene, dichlorobenzene, dichloromethane, chloroform, and combinations thereof.
  • the lead solids are dissolved in dry dimethylsulfoxide (DMSO).
  • DMSO dimethylsulfoxide
  • the Group 1 metal halide solids may be dissolved at a temperature between about 20°C to about 150°C. In one embodiment, the Group 1 metal halide solids are dissolved at room temperature (i.e. about 25°C). The Group 1 metal halide solids may be dissolved for as long as necessary to form a solution, which may take place over a time period up to about 72 hours. The resulting solution forms the Group 1 metal halide solution. In some embodiments, the Group 1 metal halide solution may have a Group 1 metal halide concentration between about 0.001M and about 10M.
  • the Group 1 metal halide solution has a Group 1 metal halide concentration of about 1 M.
  • the Group 1 metal halide solution may further comprise an amino acid (e.g., 5- aminovaleric acid, histidine, glycine, lysine), an amino acid hydrohalide (e.g., 5-amino valeric acid hydrochloride), an IFL surface-modifying (SAM) agent (such as those discussed earlier in the specification), or a combination thereof.
  • an amino acid e.g., 5- aminovaleric acid, histidine, glycine, lysine
  • an amino acid hydrohalide e.g., 5-amino valeric acid hydrochloride
  • SAM IFL surface-modifying
  • the lead halide solution and the Group 1 metal halide solution are mixed to form a thin-film precursor ink.
  • the lead halide solution and Group 1 metal halide solution may be mixed in a ratio such that the resulting thin-film precursor ink has a molar concentration of the Group 1 metal halide that is between 0% and 25% of the molar concentration of the lead halide.
  • the thin-film precursor ink may have a molar concentration of the Group 1 metal halide that is 1% of the molar concentration of the lead halide.
  • the thin-film precursor ink may have a molar concentration of the Group 1 metal halide that is 5% of the molar concentration of the lead halide.
  • the thin-film precursor ink may have a molar concentration of the Group 1 metal halide that is 10% of the molar concentration of the lead halide. In particular embodiments, the thin-film precursor ink may have a molar concentration of the Group 1 metal halide that is 15% of the molar concentration of the lead halide. In particular embodiments, the thin-film precursor ink may have a molar concentration of the Group 1 metal halide that is 20% of the molar concentration of the lead halide. In particular embodiments, the thin-film precursor ink may have a molar concentration of the Group 1 metal halide that is 25% of the molar concentration of the lead halide. In some embodiments the lead halide solution and the Group 1 metal halide solution may be stirred or agitated during or after mixing,
  • the thin-film precursor ink may then be deposited on the desired substrate.
  • Suitable substrate layers may include any of the substrate layers identified earlier in this disclosure.
  • the thin-film precursor ink may be deposited through a variety of means, including but not limited to, drop casting, spin casting, gravure coating, blade coating, reverse gravure coating, slot-die printing, screen printing, or ink-jet printing.
  • the thin- film precursor ink may be spin-coated onto the substrate at a speed of about 500 rpm to about 10,000 rpm for a time period of about 5 seconds to about 600 seconds.
  • the thin-film precursor ink may be spin-coated onto the substrate at about 3000 rpm for about 30 seconds.
  • the thin-film precursor ink may be deposited on the substrate at an ambient atmosphere in a humidity range of about 0% relative humidity to about 50% relative humidity.
  • the thin-film precursor ink may then be allowed to dry in a substantially water-free atmosphere, i.e., less than 30% relative humidity or 7 g ItO/m 3 , to form a thin film.
  • the thin film can then be thermally annealed for a time period up to about 24 hours at a temperature of about 20 °C to about 300 °C. In one embodiment, the thin film may be thermally annealed for about ten minutes at a temperature of about 50 °C.
  • the perovskite material active layer may then be completed by a conversion process in which the precursor film is submerged or rinsed with a salt solution comprising a solvent or mixture of solvents (e.g., DMF, isopropanol, methanol, ethanol, butanol, chloroform chlorobenzene, dimethyl sulfoxide, water) and salt (e.g., methylammonium iodide, formamidinium iodide, guanidinium iodide, 1,2,2- triaminovinylammonium iodide, 5-aminovaleric add hydroiodide) in a concentration between 0.001M and 10M.
  • the perovskite material thin films can also be thermally post-annealed in the same fashion as in the first line of this paragraph.
  • the salt solution may be prepared by massing the salt in a clean, dry vessel in a controlled atmosphere environment.
  • Suitable salts include, but are not limited to, methylammonium iodide, formamidinium iodide, guanidinium iodide, imidazolium iodide, ethene tetramine iodide, 1,2,2-triaminovinylammonium iodide, and 5-aminovaleric acid hydroiodide.
  • Other suitable salts may include any organic cation described above in the section entitled“Perovskite Material.”
  • the salt may comprise a single species of salt or it may comprise a salt mixture in a precise ratio.
  • the salt may comprise methylammonium iodide.
  • the salt may comprise formamidinium iodide.
  • a solvent may then be added to the vessel to dissolve the salt solids to form the salt solution. Suitable solvents include, but are not limited to, DMF, isopropanol, methanol, ethanol, butanol, chloroform chlorobenzene, dimethylsulfoxide, water, and combinations thereof.
  • formamidinium iodide salt solids are dissolved in isopropanol.
  • the salt solids may be dissolved at a temperature between about 20°C to about 150°C. In one embodiment, the salt solids are dissolved at room temperature (i.e. about 25°C).
  • the salt solids may be dissolved for as long as necessary to form a solution, which may take place over a time period up to about 72 hours.
  • the resulting solution forms the salt solution.
  • the salt solution may have a salt concentration between about 0.001M and about 10M.
  • the salt solution has a salt concentration of about 1 M.
  • using a lead (P) iodide solution, a rubidium iodide solution, and a formamidinium (FA) iodide salt solution may result in a perovskite material having the a formula of Rb / FAPbL ⁇ , where i equals a number between 0 and 1.
  • the using a lead (P) iodide solution, a cesium iodide solution, and a formamidinium (FA) iodide salt solution may result in a perovskite material having the a formula of Cs / FAPbL ⁇ , where i equals a number between 0 and 1.
  • the using a lead (P) iodide solution, a potassium iodide solution, and a formamidinium (FA) iodide salt solution may result in a perovskite material having the a formula of KFAPbL ⁇ , where i equals a number between 0 and 1.
  • the using a lead (II) iodide solution, a sodium iodide solution, and a formamidinium (FA) iodide salt solution may result in a perovskite material having the a formula of N3 ⁇ 4FAPbl3, where i equals a number between 0 and 1.
  • the using a lead (II) iodide-lead (P) chloride mixture solution, a cesium iodide solution, and a formamidinium (FA) iodide salt solution may result in a perovskite material having the a formula of Cs / FAPbt-yCly, where i equals a number between 0 and 1 andy represents a number between 0 and 3.
  • the lead halide solution as described above may have a ratio of 90: 10 of Pbh to PbCh on a mole basis.
  • a cesium iodide (Csl) solution may be added to the lead halide solution by the method described above to form a thin film precursor ink with 10 mol% Csl.
  • a FAPblg perovskite material may be produced according to the method described above using this thin film precursor solution. The addition of cesium ions through the Csl solution as described above may cause chloride anions and Cesium atoms to incorporate into the FAPbL ⁇ crystal lattice.
  • Table 1 shows lattice parameters for FAPbD perovskite materials with 10 mol% rubidium and 20 mol % chloride (e.g. 10 mol% PbCh), 10 mol% cesium, and 10 mol% cesium with 20 mol% chloride, wherein the mol% concentration represents the concentration of the additive with respect to the lead atoms in the lead halide solution.
  • the FAPbt perovskite material with cesium and chloride added has smaller lattice parameters than the other two perovskite material samples.
  • FIG. 29 shows x-ray diffraction patterns corresponding to each of the samples presented in Table 1.
  • Tables 2-4 provide the x-ray diffraction peaks and intensity for the three perovskite materials shown in Table 1. The data were collected at ambient conditions on a Rigaku Miniflex 600 using a Cu Ka radiation source at a scan rate of 1.5 degrees 20/min.
  • the perovskite materials produced with 10mol% Rb and 10mol% Cl, 10mol% Cs, and 10% Cs and 10% Cl each have diffraction patterns conforming to the expected pattern for a cubic, Pm3- m perovskite material.
  • So-called“layered” 2D perovskites are known to form when perovskites are formulated with organic cations having alkyl chains longer than the methylammonium and formamidinium cations described previously herein.
  • Layered 2D perovskites include structures such as the Ruddlesden-Popper phase, Dion-Jacobson phase, and Aurivillius phase. For example, by substituting 1 -butylammonium in place of the methylammonium or the other cations described above, during formation of a perovskite in a“one-step” method (not described herein), a Ruddlesden-Popper 2D perovskite may result.
  • FIG. 5 illustrates a structure of a Ruddlesden-Popper perovskite 5500 with a 1 -butylammonium cation 5510.
  • the“tails” of the butylammonium cation 5510 result in a separation between the lead and iodide portion of the perovskite material and other lead and iodide structures, resulting in “sheets” of 2D perovskites.
  • FIG. 6 illustrates an embodiment of a perovskite material 2000 with addition of an alkyl ammonium cation for surface passivation.
  • the surface of a formamidinium lead iodide (FAPblg) perovskite material 2010 is shown with 1 -butylammonium cation 2020 at the surface.
  • FAPblg formamidinium lead iodide
  • the 1 -butylammonium cation, or other“bulky” organic cations as described herein may diffuse into the perovskite material near the surface of the perovskite material crystal lattice, in some embodiments.
  • the 1 -butylammonium cation, or other“bulky” organic cations as described herein may reside 50 nm or less into the perovskite material from the crystal lattice surfaces or grain boundaries.
  • “bulky” organic cations such as 1- butylammonium
  • inclusion of such organic cations may cause the perovskite material to have a formula that is either substoichiometric or superstoichiometric with respect to the CMXs formula described herein.
  • the general formula for the perovskite material may be expressed as C x M y X z , where x, y and z are real numbers.
  • a perovskite material may have the formula C’2C n -iMnX3n-i, where n is an integer.
  • the perovskite material may have the formula C 2 MX 4
  • the perovskite material may have the formula C 2 CM 2 X7
  • the perovskite material may have the formula C’ 2 C 2 M3X 10
  • the perovskite material may have the formula C' 2 C 3 M 4 X 13 and so on.
  • the n-value indicates the thickness of an inorganic metal halide sublattice of the perovskite material.
  • a phase of the perovskite material having the formula C’ 2 C n-1 M n X3 n-1 may form in regions where a bulky organic cation has diffused into, or otherwise entered into, the crystal lattice of a perovskite material.
  • a phase may be present within 50 nanometers of a crystal lattice surface (e.g. a surface or grain boundary) of a perovskite material that has been formed including a bulky organic cation as disclosed herein.
  • the carbon“tails” of the 1 -butyl ammonium ion may provide a protective property to the surface of the perovskite by effectively keeping other molecules away from the surface.
  • the alkyl group“tail” of the 1 -butyl ammonium ion may be oriented away from or parallel to the surface of the perovskite material.
  • the 1-butylammonium “tails” have hydrophobic properties, which prevents water molecules from contacting the surface of the perovskite and protects the surface of the perovskite material 2010 from water in the environment.
  • the 1-butylammonium cations may also act to passivate the surface and any grain boundaries or defects with the perovskite material 2010. Passivation refers to an electrical characteristic that prevents charge accumulation or“trap states” at the surface or grain boundaries of the perovskite material 2010. By acting to passivate portions of perovskite material 2010 the 1-butylammonium may facilitate improved charge transfer in and out of the perovskite material 2010 and improve the electrical properties of the photoactive layer.
  • other organic cations may be applied in place of, or in combination with, 1-butylammonium.
  • examples of other“bulky organic” organic cations that may act as to surface passivate perovskite material include, but are not limited to, ethylammonium, propyl ammonium, n-butylammonium; perylene n-butylamine-imide; butane-
  • 1,4-diammonium 1,4-diammonium; 1 -pentylammonium; 1 -hexylammonium; poly(vinylammonium); phenyl ethyl ammonium; 3 -phenyl- 1-propylammonium; 4-phenyl- 1-butylammonium; 1,3- dimethylbutylammonium; 3 , 3 -dimethylbutyl ammonium; 1 -heptylammonium; 1-octylammonium; 1-nonylammonium; 1 -decylammonium; and 1-icosanyl ammonium.
  • heteroatom may coordinate with, bind to, or integrate with the perovskite material crystal lattice.
  • a heteroatom may be any atom in the tail that is not hydrogen or carbon, including nitrogen, sulfur, oxygen, or phosphorous.
  • “bulky” organic cations may include the following molecules functionalized with an ammonium group, phosphonium group, or other cationic group that may integrate into a surface “C-site of a perovskite material: benzene, pyridine, naphthalene, anthracene, xanthene, phenathrene, tetracene chrysene, tetraphene, benzo[c]phenathrene, triphenylene, pyrene, perylene, corannulene, coronene, substituted dicarboxylic imides, aniline, N-(2-aminoethyl)-2-isoindole- 1 ,3-dione, 2-(l -aminoethyl)naphthalene, 2-triphenylene-O- ethylamine ether, benzylamine, benzylammonium salts, N-n-butyl-
  • FIGs. 17-28 provide illustrations of the structures of these organic molecules, according to certain embodiments.
  • the illustrated molecules may include any hydrohalide of each illustrated amine, for example benzylammonium salts, where the illustrated X group may be F, Cl, Br, I, SCN, CN, or any other pseudohalide.
  • non-halide acceptable anions may include: nitrate, nitrite, carboxylate, acetate, acetonyl acetonate, formate, oxalate, sulfate, sulfite, thiosulfate, phosphate, tetrafluoroborate, hexafluorophosphate, tetra(perfluorophenyl) borate, hydride, oxide, peroxide, hydroxide, nitride, arsenate, arsenite, perchlorate, carbonate, bicarbonate, chromate, dichromate, iodate, bromate, chlorate, chlorite, hypochlorite, hypobromite, cyanide, cyanate, isocyanate, fulminate, thiocyanate, isothiocyanate, azide, tetracarbonylcobaltate, carbamoyldicyanomethanide, dicyanonitrosomethanide, dicyanamide, tri
  • the bulky organic cation may passivate grain boundaries and surface defects in the perovskite material
  • FIG. 7 illustrates an example embodiment of a perovskite material layer 3000 with 1-butylammonium 3020 passivating both the surface and grain boundaries 3015 of a bulk perovskite material 3010.
  • the alkyl tails of these ions may also form a hydrophobic layer which repels water and other polar species and impedes such species from reaching the surface of the perovskite material. As can be seen in FIG.
  • the“tails” of the bulky organic cations may not be chemically connected (e.g., covalently or ionically bonded) to the surface or grain boundaries 3015 of the perovskite material layer 3000.
  • “tails” of any bulky organic cation refers to the non-ionic carbon structure of the bulky organic cation.
  • the tail of 1-butylammonium is the butyl group and the tail of benzyl ammonium is the benzyl group.
  • the tails of the bulky organic cation may also assume other arrangements with respect to the surface or grain boundary of a perovskite material.
  • the cationic“head” of a bulky organic cation will not diffuse more than 50 nanometers past the surface or a grain boundary of a perovskite material.
  • the tail may interact weakly with the perovskite material and be oriented away from the perovskite material crystal grain surface.
  • the tail may have an intermolecular interaction (e.g., dipole-dipole or hydrogen bonding) with the perovskite material crystal grain surface resulting in a configuration where the tail is oriented towards the perovskite material crystal grain surface.
  • the tails of some bulky organic cations present in the perovskite material may not interact with the surfaces or grain boundaries of the perovskite material and the tails of other bulky organic cations in the perovskite material may interact with the surfaces or grain boundaries of the perovskite material.
  • the tail may contain a heteroatom or anion (i.e., a zwitterion) with at least one electron lone pair that may interact covalently (i.e., a coordination covalent bond) with the perovskite material crystal grain surface via a metal atom (e.g., Pb, Sn, Ge, In, Bi, Cu, Ag, Au) present in the perovskite material.
  • the tail may also include a cationic species, such as diammonium butane as described herein, that may incorporate into the perovskite material by substituting on at least two“C” cation sites (such as formamidinium).
  • a tail including a cationic species may also bridge two layers of a 2D perovskite material, lie prone across the perovskite material crystal grain surface, or orient away from the perovskite material crystal grain surface in a similar manner to that described with respect to a non-ionic tail.
  • a bulky organic cation having a sufficiently bulky tail such as an imidazolium cation, may simply reside on the perovskite surface or grain boundary without diffusing into the perovskite material.
  • the bulky organic cations with tail groups that vary in length or size may be applied to the perovskite to passivate grain boundaries and surface defects in the perovskite material.
  • FIG. 8 illustrates an example embodiment of a perovskite material layer 4000 with a combination of 1 -butyl ammonium 4020, 1-nonylammonium 4021, 1- heptylammonium 4022, and 1 -hexyl ammonium 4023 passivating both the surface and grain boundaries 4015 of a bulk perovskite material 4010.
  • any mixture of the alkylammonium compounds identified above may be applied to a perovskite material as described herein.
  • FIG. 8 illustrates an example embodiment of a perovskite material layer 4000 with a combination of 1-butylammonium 4020, 1-nonylammonium 4021, 1 -heptylammonium 4022, and 1 -hexyl ammonium 4023 passivating both the surface and grain boundaries 4015 of a bulk perovskite material 4010.
  • any mixture of the alkylammonium compounds identified above may be applied to a perovskite material as described herein.
  • bulky organic cations may include a benzyl group.
  • FIG. 8A illustrates an example embodiment of a perovskite material layer 4500 with a variety of bulky organic cations containing benzyl groups passivating both the surface and grain boundaries 4515 of a bulk perovskite material 4510.
  • FIG. 9 shows a comparison of images taken of a perovskite material with and without a 1-butylammonium (“BAT’) surface coating over a period of 48 days. Both perovskite materials had the same composition and were exposed to an environment having a temperature of 85 °C at 55% relative humidity for 48 days. As can be seen from the photographs, the perovskite material having no 1-butylammonium surface coating lightens in color significantly after one day of exposure to the environment, indicating that the perovskite material has degraded significantly.
  • BAT 1-butylammonium
  • the perovskite material having the 1-butylammonium surface coating shows a gradual lightening of color over 48 days and remains partially dark after 48 days. This indicates that the perovskite material with the 1-butylammonium surface coating is more robust than a perovskite material without a 1-butylammonium surface coating during extended exposure to a high-temperature environment.
  • FIG. 10 shows a comparison of images taken of a perovskite material with and without a 1-butylammonium (“BAT’) surface coating over a period of seven days.
  • Both perovskite materials had the same composition and were exposed to an environment having a temperature of 85 °C at 0% relative humidity for 7 days.
  • the perovskite material having no 1-butylammonium surface coating lightens in color significantly after one day of exposure to the environment, indicating that the perovskite material has degraded significantly.
  • the perovskite material having the 1-butylammonium surface coating shows very little change in color after seven days. This indicates that the perovskite material with the 1-butylammonium surface coating did not completely break down during extended exposure to a high-temperature, high-humidity environment.
  • perylene n-butylamine-imide may be applied to the surface of a perovskite material as described above with respect to 1-butylammonium.
  • FIGs. 11A-D illustrate various perylene monoimides and diimides that may be applied to the surface of a perovskite material according to the present disclosure.
  • FIG. 12 illustrates an embodiment of a perovskite material 2500 with addition of an alkyl ammonium cation for surface passivation. In the illustrated embodiment, the surface of a formamidinium lead iodide (FAPbL ⁇ ) perovskite material 2510 is shown with perylene n-butylamine-imide 2520 at the surface.
  • FAPbL ⁇ formamidinium lead iodide
  • the carbon“tails” of the perylene n-butylamine-imide ion may provide a protective property to the surface of the perovskite by effectively keeping other molecules away from the surface.
  • the perylene n-butylamine-imide“tails” have hydrophobic properties, which prevents water molecules from contacting the surface of the perovskite and protects the surface of the perovskite material 2510 from water in the environment.
  • the perylene n-butylamine-imide cations may also act to passivate the surface and any grain boundaries or defects with the perovskite material 2510. By acting to passivate portions of perovskite material 2510 the perylene n-butylamine-imide may facilitate improved charge transfer in and out of the perovskite material 2510 and improve the electrical properties of the photoactive layer.
  • a lead halide precursor ink is formed.
  • An amount of lead halide may be massed in a clean, dry vessel in a controlled atmosphere environment (e.g., controlled atmosphere box with glove-containing portholes allows for materials manipulation in an air-free environment).
  • Suitable lead halides include, but are not limited to, lead (P) iodide, lead (P) bromide, lead (P) chloride, and lead (P) fluoride.
  • the lead halide may comprise a single species of lead halide or it may comprise a lead halide mixture in a precise ratio.
  • the lead halide mixture may comprise any binary, ternary, or quaternary ratio of 0.001-100 mol% of iodide, bromide, chloride, or fluoride.
  • the lead halide mixture may comprise lead (P) chloride and lead (P) iodide in a ratio of about 10:90 mol:mol.
  • the lead halide mixture may comprise lead (P) chloride and lead (P) iodide in a ratio of about 5:95, about 7.5:92.5, or about 15:85 mol:mol.
  • Suitable precursor salts may comprise any combination of lead (P) or lead(IV) and the following anions: nitrate, nitrite, carboxylate, acetate, acetonyl acetonate, formate, oxalate, sulfate, sulfite, thiosulfate, phosphate, tetrafluoroborate, hexafluorophosphate, tetra(perfluorophenyl) borate, hydride, oxide, peroxide, hydroxide, nitride, arsenate, arsenite, perchlorate, carbonate, bicarbonate, chromate, dichromate, iodate, bromate, chlorate, chlorite, hypochlorite, hypobromite, cyanide, cyanate, isocyanate, fulminate, thi
  • the precursor ink may further comprise a lead (P) or lead (IV) salt in mole ratios of 0 to 100% to the following metal ions Be, Mg, Ca, Sr, Ba, Fe, Cd, Co, Ni, Cu, Ag, Au, Hg, Sn, Ge, Ga, In, ⁇ , Sb, Bi, Ti, Zn, Cd, Hg, and Zr as a salt of the aforementioned anions.
  • a lead (P) or lead (IV) salt in mole ratios of 0 to 100% to the following metal ions Be, Mg, Ca, Sr, Ba, Fe, Cd, Co, Ni, Cu, Ag, Au, Hg, Sn, Ge, Ga, In, ⁇ , Sb, Bi, Ti, Zn, Cd, Hg, and Zr as a salt of the aforementioned anions.
  • a solvent may then be added to dissolve the lead solids to form the lead halide precursor ink.
  • Suitable solvents include, but are not limited to, dry N-cyclohexyl-2-pyrrolidone, alkyl-2-pyrrolidone, dimethylformamide, dialkylformamide, dimethylsulfoxide (DMSO), methanol, ethanol, propanol, butanol, tetrahydrofuran, formamide, tert-butylpyridine, pyridine, alkylpyridine, pyrrolidine, chlorobenzene, dichlorobenzene, dichloromethane, chloroform, and combinations thereof.
  • the lead solids are dissolved in dry dimethylformamide (DMF).
  • the lead solids may be dissolved at a temperature between about 20°C to about 150°C. In one embodiment, the lead solids are dissolved at about 85°C. The lead solids may be dissolved for as long as necessary to form a solution, which may take place over a time period up to about 72 hours. The resulting solution forms the base of the lead halide precursor ink.
  • the lead halide precursor ink may have a lead halide concentration between about 0.001M and about 10M. In one embodiment, the lead halide precursor ink has a lead halide concentration of about 1 M.
  • the lead halide precursor ink may further comprise an amino acid (e.g., 5-aminovaleric acid, histidine, glycine, lysine), an amino acid hydrohalide (e.g., 5-amino valeric acid hydrochloride), an IFL surface-modifying (SAM) agent (such as those discussed earlier in the specification), or a combination thereof.
  • an amino acid e.g., 5-aminovaleric acid, histidine, glycine, lysine
  • an amino acid hydrohalide e.g., 5-amino valeric acid hydrochloride
  • SAM IFL surface-modifying
  • formamidinium chloride may be added to the lead halide precursor ink.
  • the halide of any cation discussed earlier in the specification may be used.
  • combinations of additives may be added to the lead halide precursor ink including, for example, the combination of formamidinium chloride and 5-amino valeric acid hydrochloride.
  • the additives including formamidinium chloride and/or 5-amino valeric acid hydrochloride may be added to the lead halide precursor ink at various concentrations depending on the desired characteristics of the resulting perovskite material.
  • the additives may be added in a concentration of about 1 nM to about 1 M.
  • the additives may be added in a concentration of about 1 mM to about 1 M.
  • the additives may be added in a concentration of about 1 mM to about 1 mM.
  • a Group 1 metal halide solution is formed to be added to the lead halide precursor ink.
  • An amount of Group 1 metal halide may be massed in a clean, dry vessel in a controlled atmosphere environment.
  • Suitable Group 1 metal halides include, but are not limited to, cesium iodide, cesium bromide, cesium chloride, cesium fluoride, rubidium iodide, rubidium bromide, rubidium chloride, rubidium fluoride, lithium iodide, lithium bromide, lithium chloride, lithium fluoride, sodium iodide, sodium bromide, sodium chloride, sodium fluoride, potassium iodide, potassium bromide, potassium chloride, potassium fluoride.
  • the Group 1 metal halide may comprise a single species of Group 1 metal halide or it may comprise a Group 1 metal halide mixture in a precise ratio.
  • the Group 1 metal halide may comprise cesium iodide.
  • the Group 1 metal halide may comprise rubidium iodide.
  • the Group 1 metal halide may comprise sodium iodide.
  • the Group 1 metal halide may comprise potassium iodide.
  • Group 1 metal salt precursors may be used in conjunction with or in lieu of Group 1 metal halide salts to form a Group 1 metal salt solution.
  • Suitable precursor Group 1 metal salts may comprise any combination of Group 1 metals and the following anions: nitrate, nitrite, carboxylate, acetate, formate, oxalate, sulfate, sulfite, thiosulfate, phosphate, tetrafluoroborate, hexafluorophosphate, tetra(perfluorophenyl) borate, hydride, oxide, peroxide, hydroxide, nitride, arsenate, arsenite, perchlorate, carbonate, bicarbonate, chromate, dichromate, iodate, bromate, chlorate, chlorite, hypochlorite, hypobromite, cyanide, cyanate, isocyanate, fulminate, thiocyanate, isothi
  • a solvent may then be added to the vessel to dissolve the Group 1 metal halide solids to form the Group 1 metal halide solution.
  • Suitable solvents include, but are not limited to, dry N-cyclohexyl-2-pyrrolidone, alkyl-2-pyrrolidone, dimethylformamide (DMF), dialkylformamide, dimethylsulfoxide (DMSO), methanol, ethanol, propanol, butanol, tetrahydrofuran, formamide, tert-butylpyridine, pyridine, alkylpyridine, pyrrolidine, chlorobenzene, dichlorobenzene, dichloromethane, chloroform, and combinations thereof.
  • the lead solids are dissolved in dry dimethylsulfoxide (DMSO).
  • DMSO dimethylsulfoxide
  • the Group 1 metal halide solids may be dissolved at a temperature between about 20°C to about 150°C. In one embodiment, the Group 1 metal halide solids are dissolved at room temperature (i.e. about 25°C). The Group 1 metal halide solids may be dissolved for as long as necessary to form a solution, which may take place over a time period up to about 72 hours. The resulting solution forms the Group 1 metal halide solution. In some embodiments, the Group 1 metal halide solution may have a Group 1 metal halide concentration between about 0.001M and about 10M.
  • the Group 1 metal halide solution has a Group 1 metal halide concentration of about 1 M.
  • the Group 1 metal halide solution may further comprise an amino acid (e.g., 5- aminovaleric acid, histidine, glycine, lysine), an amino acid hydrohalide (e.g., 5-amino valeric acid hydrochloride), an IFL surface-modifying (SAM) agent (such as those discussed earlier in the specification), or a combination thereof.
  • an amino acid e.g., 5- aminovaleric acid, histidine, glycine, lysine
  • an amino acid hydrohalide e.g., 5-amino valeric acid hydrochloride
  • SAM IFL surface-modifying
  • the lead halide solution and the Group 1 metal halide solution are mixed to form a thin-film precursor ink.
  • the lead halide solution and Group 1 metal halide solution may be mixed in a ratio such that the resulting thin-film precursor ink has a molar concentration of the Group 1 metal halide that is between 0% and 25% of the molar concentration of the lead halide.
  • the thin-film precursor ink may have a molar concentration of the Group 1 metal halide that is 1% of the molar concentration of the lead halide.
  • the thin-film precursor ink may have a molar concentration of the Group 1 metal halide that is 5% of the molar concentration of the lead halide.
  • the thin-film precursor ink may have a molar concentration of the Group 1 metal halide that is 10% of the molar concentration of the lead halide. In particular embodiments, the thin-film precursor ink may have a molar concentration of the Group 1 metal halide that is 15% of the molar concentration of the lead halide. In particular embodiments, the thin-film precursor ink may have a molar concentration of the Group 1 metal halide that is 20% of the molar concentration of the lead halide. In particular embodiments, the thin-film precursor ink may have a molar concentration of the Group 1 metal halide that is 25% of the molar concentration of the lead halide.
  • the lead halide solution and the Group 1 metal halide solution may be stirred or agitated during or after mixing.
  • water may be added to the lead halide precursor ink.
  • the presence of water affects perovskite thin-film crystalline growth. Under normal circumstances, water may be absorbed as vapor from the air.
  • Suitable water includes distilled, deionized water, or any other source of water that is substantially free of contaminants (including minerals). It has been found, based on light I-V sweeps, that the perovskite PV light-to-power conversion efficiency may nearly triple with the addition of water compared to a completely dry device.
  • the water may be added to the lead halide precursor ink at various concentrations depending on the desired characteristics of the resulting perovskite material. In one embodiment, the water may be added in a concentration of about 1 nL/mL to about 1 mL/mL. In another embodiment, the water may be added in a concentration of about 1 pL/mL to about 0.1 mL/mL. In another embodiment, the water may be added in a concentration of about 1 pL/mL to about 20 mL/mL.
  • the lead halide precursor ink or the thin film precursor ink may then be deposited on the desired substrate.
  • Suitable substrate layers may include any of the substrate layers identified earlier in this disclosure.
  • the lead halide precursor ink or the thin film precursor ink may be deposited through a variety of means, including but not limited to, drop casting, spin casting, slot-die printing, screen printing, or ink-jet printing.
  • the lead halide precursor ink or the thin film precursor ink may be spin-coated onto the substrate at a speed of about 500 rpm to about 10,000 rpm for a time period of about 5 seconds to about 600 seconds.
  • the lead halide precursor ink or the thin film precursor ink may be spin-coated onto the substrate at about 3000 rpm for about 30 seconds. In some embodiments, multiple subsequent depositions of the precursor ink may be made to form a thin-film layer.
  • the lead halide precursor ink or the thin film precursor ink may be deposited on the substrate at an ambient atmosphere in a humidity range of about 0% relative humidity to about 50% relative humidity.
  • the lead halide precursor ink or the thin film precursor ink may then be allowed to dry in a substantially water-free atmosphere, i.e., less than 30% relative humidity, to form a thin film.
  • a bulky organic cation as described above e.g. benzylammonium, phenylethylammonium, ethylammonium, propylammonium, n-butylammonium; butane- 1,4-diammonium; 1 -pentylammonium; 1- hexylammonium; poly(vinylammonium); phenylethylammonium; 3 -phenyl- 1 -propylammonium; 4-phenyl- 1 -butylammonium; 1 ,3 -dimethylbutyl ammonium; 3 ,3 -dimethylbutyl ammonium; 1- heptylammonium; 1 -octylammonium; 1 -nonyl ammonium; 1 -decylammonium; 1-icosanyl ammonium; or any other organic cation as described above (e.g. benzylammonium
  • 17-28 salt solution may be applied to the thin film resulting from the deposition of the lead salt precursor and the second salt precursor.
  • Bulky organic salts may include halide, nitrate, nitrite, carboxylate, acetate, acetonyl acetonate, formate, oxalate, sulfate, sulfite, thiosulfate, phosphate, tetrafluoroborate, hexafluorophosphate, tetra(perfluorophenyl) borate, hydride, oxide, peroxide, hydroxide, nitride, arsenate, arsenite, perchlorate, carbonate, bicarbonate, chromate, dichromate, iodate, bromate, chlorate, chlorite, hypochlorite, hypobromite, cyanide, cyanate, isocyanate, fulminate, thiocyanate, isothiocyanate, azide, tetra
  • the bulky organic cation salt solution may be formed by dissolving a bulky organic cation salt in a solvent such as an alcohol, dry N-cyclohexyl-2-pyrrolidone, alkyl- 2-pyrrolidone, dimethylformamide (DMF), dialkylformamide, dimethylsulfoxide (DMSO), methanol, ethanol, propanol, butanol, tetrahydrofuran, formamide, tert-butylpyridine, pyridine, alkylpyridine, pyrrolidine, chlorobenzene, dichlorobenzene, dichloromethane, chloroform, and combinations thereof.
  • a solvent such as an alcohol, dry N-cyclohexyl-2-pyrrolidone, alkyl- 2-pyrrolidone, dimethylformamide (DMF), dialkylformamide, dimethylsulfoxide (DMSO), methanol, ethanol, propanol, butanol, tetrahydrofuran
  • the bulky organic cation salt may be dissolved in isopropyl alcohol.
  • the bulky organic cation salt solution may have a concentration between 0.0001 M and 1.0 M of the bulky organic cation salt.
  • the bulky organic cation salt solution may have a concentration between 0.01 M and 0.1 M of the bulky organic cation salt.
  • the bulky organic cation salt solution may have a concentration of between 0.02 and 0.05 M of the bulky organic cation salt.
  • the bulky organic cation salt solution may have a concentration of approximately 0.05 M of the bulky organic cation salt.
  • the bulky organic cation salt solution may be deposited onto the perovskite material precursor thin film by any method described herein with respect to solution deposition. These methods may include, spray coating, drop casting, spin casting, slot- die printing, screen printing, gravure printing, or ink-jet printing.
  • the bulky organic cation salt may be 1 -butylammonium iodide.
  • the bulky organic cation salt may be benzylammonium iodide.
  • the bulky organic cation salt may be phenylethylammonium iodide.
  • the thin film may then be thermally annealed for a time period up to about 24 hours at a temperature of about 20 °C to about 300 °C. In one embodiment, the thin film may be thermally annealed for about ten minutes at a temperature of about 50 °C.
  • the perovskite material active layer may then be completed by a conversion process in which the precursor film is submerged or rinsed with a solution comprising a solvent or mixture of solvents (e.g., DMF, isopropanol, methanol, ethanol, butanol, chloroform chlorobenzene, dimethyl sulfoxide, water) and salt (e.g., methylammonium iodide, formamidinium iodide, guanidinium iodide, 1,2,2- triaminovinylammonium iodide, 5-aminovaleric add hydroiodide) in a concentration between 0.001M and 10M.
  • the thin films may also be thermally post-annealed in the same fashion as in the first line of this paragraph.
  • a second salt precursor e.g., formamidinium iodide, formamidinium thiocyanate, or guanidinium thiocyanate
  • the thin film may have a temperature about equal to ambient temperature or have a controlled temperature between 0 °C and 500 °C.
  • the second salt precursor may be deposited at ambient temperature or at elevated temperature between about 25 °C and 125 °C.
  • the second salt precursor may be deposited by a variety of methods known in the art, including but not limited to spin-coating, slot-die printing, ink-jet printing, gravure printing, screen printing, sputtering, PE-CVD, thermal evaporation, or spray coating. In some embodiments, multiple subsequent depositions of the second salt solution may be made to form a thin-film layer. In some embodiments the second salt precursor may be a solution containing one or more solvents.
  • the second salt precursor may contain one or more of dry N-cyclohexyl-2-pyrrolidone, alkyl-2-pyrrolidone, dimethylformamide, dialkylformamide, dimethylsulfoxide (DMSO), methanol, ethanol, propanol, butanol, tetrahydrofuran, formamide, tert-butylpyridine, pyridine, alkylpyridine, pyrrolidine, chlorobenzene, dichlorobenzene, dichloromethane, chloroform, and combinations thereof.
  • any bulky organic cation salt as described herein may be combined with the second salt solution prior to deposition of the second salt solution.
  • a bulky organic cation salt solution may be prepared as described above and mixed with the second salt solution prior to deposition of the second salt solution.
  • the bulky organic cation salt solution may have a concentration between 0.0001 M and 1.0 M of the bulky organic cation salt.
  • the bulky organic cation salt solution may have a concentration between 0.01 M and 0.1 M of the bulky organic cation salt.
  • the bulky organic cation salt solution may have a concentration of between 0.02 and 0.05 M of the bulky organic cation salt.
  • the bulky organic cation salt solution may have a concentration of approximately 0.05 M of the bulky organic cation salt.
  • a bulky organic cation salt solution may be deposited onto a lead halide thin film formed after deposition of a lead halide precursor ink or thin film precursor ink.
  • a bulky organic cation salt solution may be deposited onto a perovskite precursor thin film after deposition of the second salt solution.
  • the substrate with the perovskite material precursor thin film may be annealed.
  • Annealing the substrate may convert the lead salt precursor and second salt precursor to a perovskite material, (e.g. FAPbL ⁇ , GAPb(SCN)3, FASnlg), with a surface passivating layer of the bulky organic cation.
  • Annealing may be performed in a variety of atmospheres at ambient pressure (e.g. about one atmosphere (760 Torr), depending on elevation and atmospheric conditions) or at pressures less than atmospheric or ambient (e.g., 1 mTorr to 500 mTorr).
  • An annealing atmosphere may comprise ambient air, a controlled humidity environment (e.g., 0 - 100 g H 2 O/m 3 of gas), pure argon, pure nitrogen, pure oxygen, pure hydrogen, pure helium, pure neon, pure krypton, pure CO2 or any combination of the preceding gases.
  • a controlled humidity environment may include an environment in which the absolute humidity or the % relative humidity is held at a fixed value, or in which the absolute humidity or the % relative humidity varies according to predetermined set points or a predetermined function.
  • annealing may occur in a controlled humidity environment having a % relative humidity greater than or equal to 0% and less than or equal to 50%.
  • annealing may occur in a controlled humidity environment containing greater than or equal to 0 g H 2 0/m 3 gas and less than or equal to 20 g H 2 O/m 3 gas. In some embodiments, annealing may occur at a temperature greater than or equal to 50 °C and less than or equal to 300 °C.
  • a FAPblg perovskite material may be formed by the following process.
  • First a lead (P) halide precursor comprising about a 90: 10 mole ratio of Pbb to PbCh dissolved in anhydrous DMF may be deposited onto a substrate by spin- coating, blade coating, or slot-die printing.
  • the lead halide precursor ink may be allowed to dry in a substantially water-free atmosphere, i.e., less than 30% relative humidity or 17 g ItO/m 3 , for approximately one hour (+ 15 minutes) to form a thin film.
  • the thin film may be subsequently thermally annealed for about ten minutes at a temperature of about 50 °C (+ 10 °C).
  • the lead halide precursor may be deposited by ink-jet printing, gravure printing, screen printing, sputtering, PE-CVD, atomic-layer deposition, thermal evaporation, or spray coating.
  • a 1 -butyl ammonium salt solution having a concentration of 0.05 M in isopropyl alcohol may be deposited onto the lead halide thin film.
  • a formamidinium iodide precursor comprising a 15 - 100 mgZmL concentration of formamidinium iodide dissolved in anhydrous isopropyl alcohol may be deposited onto the lead halide thin film by spin coating or blade coating.
  • the formamidinium iodide precursor may be deposited by ink-jet printing, gravure printing, screen printing, slot-die printing, sputtering, PE-CVD, atomic-layer deposition, thermal evaporation, or spray coating.
  • the substrate may be annealed at about 25% relative humidity (about 4 to 7 g H 2 O/m 3 gas) and between about 100 °C and 200 °C to form a formamidinium lead iodide (FAPblg) perovskite material, with a surface layer of 1- butylammonium.
  • FAPblg formamidinium lead iodide
  • the 1 -butyl ammonium salt solution may be deposited onto the thin film formed after deposition of the formamidinium iodide precursor.
  • the 1 -butylammonium salt solution may be combined with the lead halide precursor ink prior to deposition of the lead halide precursor ink.
  • the 1 -butylammonium salt solution may be combined with the formamidinium iodide precursor prior to deposition of the formamidinium iodide precursor.
  • the 1- butylammonium salt solution may be deposited onto the thin film following deposition of the formamidinium iodide precursor and prior to annealing the thin film and substrate.
  • the 1 -butylammonium salt solution may be deposited onto the thin film after annealing the thin film and substrate.
  • a perovskite material having the formula of Cs / MAPbL ⁇ , where i equals a number between 0 and 1 with a surface layer of 1 -butylammonium.
  • the using a lead (P) iodide solution, a rubidium iodide solution, a formamidinium (FA) iodide salt solution, and a 1 -butylammonium salt solution may result in a perovskite material having the formula of Rb / FAPblg, where i equals a number between 0 and 1 with a surface layer of 1-butylammonium layer.
  • a perovskite material having the formula of Cs / FAPbl 3 , where i equals a number between 0 and 1 with a surface layer of 1- butylammonium layer.
  • the using a lead (P) iodide solution, a potassium iodide solution, a formamidinium (FA) iodide salt solution, and a 1-butylammonium salt solution may result in a perovskite material having the formula of K i FAPbl 3 , where i equals a number between 0 and 1 with a surface layer of 1-butylammonium layer.
  • the using a lead (P) iodide solution, a sodium iodide solution, a formamidinium (FA) iodide salt solution, and a 1-butylammonium salt solution may result in a perovskite material having the formula of NaiFAPbl3, where i equals a number between 0 and 1 with a surface layer of 1-butylammonium layer.
  • the using a lead (P) iodide-lead (P) chloride mixture solution, a cesium iodide solution, a formamidinium (FA) iodide salt solution, and a 1-butylammonium salt solution may result in a perovskite material having the formula of Cs I FAPbl 3-y Cl y , where i equals a number between 0 and 1 and y represents a number between 0 and 3 with a surface layer of 1- butylammonium layer.
  • a FAPbl 3 perovskite material may be formed by the following process.
  • First a lead (P) halide precursor ink comprising about a 90:10 mole ratio of Pbh to PbCh dissolved in anhydrous DMF may be deposited onto a substrate by spin-coating, blade coating, or slot-die printing.
  • the lead halide precursor ink may be allowed to dry in a substantially water-free atmosphere, i.e., less than 30% relative humidity or 17 g H 2 O/m 3 for approximately one hour (+ 15 minutes) to form a thin film.
  • the thin film may be subsequently thermally annealed for about ten minutes at a temperature of about 50 °C (+ 10 °C).
  • the lead halide precursor may be deposited by ink-jet printing, gravure printing, screen printing, sputtering, PE-CVD, atomic-layer deposition, thermal evaporation, or spray coating.
  • a formamidinium iodide precursor comprising a 15 - 60 mg/mL concentration of formamidinium iodide dissolved in anhydrous isopropyl alcohol may be deposited onto the lead halide thin film by spin coating or blade coating.
  • the formamidinium iodide precursor may be deposited by ink-jet printing, gravure printing, screen printing, slot-die printing, sputtering, PE-CVD, atomic-layer deposition, thermal evaporation, or spray coating.
  • a benzylammonium salt solution having a concentration of 0.04 M in isopropyl alcohol may be deposited onto the perovskite material precursor thin film.
  • the substrate may be annealed at about 25 % relative humidity (about 4 to 7 g H 2 O/m 3 gas) and between about 100 °C and 200 °C to form a formamidinium lead iodide (FAPblg) perovskite material, with a surface layer of benzylammonium.
  • FAPblg formamidinium lead iodide
  • the benzylammonium salt solution may be deposited onto the lead halide thin film prior to deposition of the formamidinium iodide precursor.
  • the benzylammonium salt solution may be combined with the lead halide precursor ink prior to deposition of the lead halide precursor ink.
  • the benzylammonium salt solution may be combined with the formamidinium iodide precursor prior to deposition of the formamidinium iodide precursor.
  • the resulting perovskite material may have a cubic crystal structure in the bulk material away from the surface. The presence of bulky organic cations near the surface of the perovskite material may result in a non-cubic crystal structure near the surface of the perovskite material.
  • a perovskite material having the formula of Cs / MAPbL ⁇ , where i equals a number between 0 and 1 with a surface layer of benzylammonium.
  • a perovskite material having the formula of Rb / FAPblg, where i equals a number between 0 and 1 with a surface layer of benzylammonium layer.
  • a perovskite material having the formula of Cs / FAPblg, where i equals a number between 0 and 1 with a surface layer of benzylammonium layer.
  • a perovskite material having the formula of K,FAPbIg, where i equals a number between 0 and 1 with a surface layer of benzylammonium layer.
  • a perovskite material having the formula of N3 ⁇ 4FAPbL ⁇ , where i equals a number between 0 and 1 with a surface layer of benzylammonium r.
  • a lead (P) iodide-lead (P) chloride mixture solution a cesium iodide solution, a formamidinium (FA) iodide salt solution, and a benzylammonium salt solution may result in a perovskite material having the formula of Cs / FAPblg-yCly, where i equals a number between 0 and 1 andy represents a number between 0 and 3 with a surface layer of benzylammonium layer.
  • a lead iodide precursor ink is prepared by dissolving PbL ⁇ , PbCh, and cesium iodide (Csl) in a mixture of DMF and DMSO solvents.
  • Csl cesium iodide
  • a 1.5 M CsIZDMSO solution is prepared by dissolving Csl in DMSO.
  • the CsIZDMSO solution may be prepared, in a particular embodiment, by stirring Csl into DMSO at a ratio of 1.5 mmol of Csl per 1.0 mL of anhydrous DMSO at room temperature for between 1 hour and 2.5 hours.
  • the aforementioned Csl solution is added to a solution of PbL ⁇ , PbCL ⁇ , and anhydrous DMF solvent to form a 1.28 M Pb 2+ solution in which the ratios of Cs to Pb is 1 : 10 and the ratio of I to Cl is 9: 1.
  • the 1.28 M Pb 2+ solution may be prepared by adding the Csl solution into a vessel containing 1.26 mmol of PbL ⁇ , 0.14 mmol of PbCL ⁇ , and 1.0 mL of anhydrous DMF solvent for each 93.8 pL of the Csl solution.
  • the Pb 2+ solution is mixed at a temperature between 50 °C and 100 °C for between 1.5 hour and 2.5 hours before being cooled to form the lead iodide precursor ink.
  • the Pb 2+ solution may be stirred at 85 °C for two hours before being cooled by stirring the solution in a room temperature environment for one hour.
  • the lead iodide precursor ink may be filtered prior to deposition of the lead iodide precursor ink. A 0.2 pm filter may be used to filter the lead iodide precursor ink, in a particular embodiment.
  • Formamidinium iodide (FAI) and benzylammonium iodide (BzAI) solutions are prepared by dissolving FAI and BzAI salts in anhydrous isopropanol (IP A) to form a 0.2 M FAI solution and 0.05 M BzAI solution, respectively.
  • IP A isopropanol
  • both the FAI and BzAI solutions may be held at 75 °C during the following coating process.
  • the lead iodide precursor ink is deposited onto a substrate and subsequently annealed to form a lead iodide film.
  • the lead iodide precursor ink held at 45 °C may be blade-coated onto a substrate coated with a nickel oxide (NiO) thin film layer and subsequently annealed at 50 °C for 10 minutes to form the lead iodide film.
  • NiO nickel oxide
  • the lead iodide film is first underwashed with one coat of the BzAI solution, followed by three coats of the FAI solution. Following deposition of each of the coats of BzAI solution and FAI solution, the coat is allowed to dry prior to deposition of the following coating. In particular embodiments, both the BzAI and the FAI solutions may be held at 45 °C during deposition of each respective coat.
  • the substrate and coatings may be annealed to form the perovskite material layer. In a particular embodiment, after the third FAI has been deposited, the substrate is immediately heated to 157 °C for 5 minutes to anneal the perovskite material layer.
  • depositing the BzAI solution onto the lead iodide film prior to deposition of the FAI solution may provide intermediate templating for growth of the 3D FAPblg perovskite material by formation of a 2D perovskite material.
  • BzAI may react with lead iodide thin film to form an intermediate 2D perovskite material phase.
  • the BzA + cations in the 2D phase may be fully or partially replaced with FA + cations to form a 3D FAPblg framework.
  • the BzAI may also passivate crystal defects in the 3D FAPblg perovskite material.
  • FIG. 31 illustrates both optical (absorbance) and photoluminescence images of a perovskite material photovoltaic device 3105 produced without addition of BzAI and perovskite material photovoltaic device 3110 produced with BzAI as described herein.
  • FIG. 31 shows that the optical image of perovskite material photovoltaic device 3110 is darker, indicating a higher light absorbance, and the photoluminescence image of perovskite material photovoltaic device 3110 is brighter than perovskite material photovoltaic device 3105.
  • FIG. 32 illustrates power output curve 3205 corresponding to a photovoltaic device without BzAI, such as photovoltaic device 3105, and power output curve 3210 corresponding to a photovoltaic device with BzAI as described herein, such as photovoltaic device 3110.
  • the power output measurements depicted in FIG. 32 were measured at maximum power point under 100 mW/cm 2 AM1.5G illumination for 180 seconds with an intervening 30 second dark measurement to demonstrate steady-state performance. As can be seen from FIG.
  • FIG. 33 illustrates a current-voltage (I-V) scan 3320 of a perovskite material photovoltaic device produced without BzAI, labeled as the sample“5f” line, and a perovskite material photovoltaic device produced with BzAI, labeled as the sample“lOf” line.
  • I-V current-voltage
  • Voc open- circuit voltage
  • Jsc short-circuit current density
  • FF Fill Factor
  • PCE power conversion efficiency
  • FIG. 35 illustrates external quantum efficiency (EQE) of six perovskite material photovoltaic devices produced without BzAI (plot 3505) and six perovskite material photovoltaic devices produced with BzAI (plot 3510).
  • EQE external quantum efficiency
  • FIG. 36 shows an admittance spectroscopy plot 3605 for perovskite material photovoltaic devices produced without BzAI and an admittance spectroscopy plot 3610 for perovskite material photovoltaic devices produced with BzAI.
  • Admittance spectroscopy plot 3610 shows suppressed ion migration for sample devices including benzylammonium when compared to admittance spectroscopy plot 3605 for sample devices not including benzylammonium. Excessive ion migration is known to have deleterious effects on perovskite material device performance and durability, indicating that the inclusion of benzylammonium in perovskite material photovoltaic devices may increase device performance and durability.
  • incorporación of 1,4-diammonium butane, or other poly-ammonium organic compounds as described below, into the crystal structure of a perovskite material may improve the properties of that material.
  • addition of 1,4-diammonium butane into a FAPbh perovskite as described below may provide the perovskite material with advantageous properties.
  • 1,4-diammonium butane may be incorporated into a perovskite material utilizing a 1,4-diammonium butane salt in the place of the bulky organic cation salt in the process described above, and the addition of the 1,4-diammonium butane salt (or other organic polyammonium salt described herein) may occur at any stage of the perovskite production method for which addition of the bulky organic cation salt is described above.
  • organic cations such as 1,4-diammonium butane
  • inclusion of such organic cations may cause the perovskite material to have a formula that is either substoichiometric or superstoichiometric with respect to the FAPbL ⁇ formula.
  • the general formula for the perovskite material may be expressed as C M ⁇ X ? , where x, y and z are real numbers.
  • a 1,4-diammonium butane salt solution may be added to the lead halide precursor ink solution prior to deposition.
  • a 1,4-diammonium butane salt may be added to the lead halide precursor ink solution at a concentration of 0.001 mol% to 50 mol%.
  • the 1,4-diammonium butane salt may be added to the lead halide precursor ink solution at a concentration of 0.1 mol% to 20 mol%.
  • the 1,4-diammonium butane salt may be added to the lead halide precursor ink solution at a concentration of 1 mol% to 10 mol%.
  • 1,4-diammonium butane salt may be added to the formamidinium salt solution prior to contacting the formamidinium salt solution with the lead halide precursor thin film as described above.
  • a 1,4-diammonium butane salt may be added to the formamidinium iodide salt solution at a concentration of 0.001 mol% to 50 mol%.
  • the 1,4-diammonium butane salt may be added to the formamidinium iodide salt solution at a concentration of 0.1 mol% to 20 mol%.
  • the 1,4-diammonium butane salt may be added to the formamidinium iodide salt solution at a concentration of 1 mol% to 10 mol%.
  • a 1,4-diammonium butane salt precursor solution may be deposited onto a lead halide thin film formed after deposition of a lead halide precursor ink or onto a perovskite precursor thin film after deposition of the formamidinium salt solution.
  • the 1,4-diammonium butane salt precursor solution may have a concentration of 0.001 mol% to 50 mol%.
  • the 1,4-diammonium butane salt precursor solution may have a concentration of 0.1 mol% to 20 mol%.
  • the 1,4- diammonium butane salt precursor solution may have a concentration of 1 mol% to 10 mol%.
  • An example method for depositing a perovskite material including 1,4- diammonium butane includes depositing a lead salt precursor onto a substrate to form a lead salt thin film and depositing an organic cation salt precursor comprising a first organic cation salt onto the lead salt thin film to form a perovskite precursor thin film.
  • the lead salt precursor or the organic cation salt precursor may include a 1,4-diammonium butane salt or a 1,4-diammonium butane salt precursor may be deposited onto the lead salt thin film or the perovskite precursor thin film.
  • the substrate and perovskite precursor thin film may be annealed to form a perovskite material that includes 1,4-diammonium butane.
  • the lead salt precursor and organic cation salt precursor may include any solutions described herein used to produce a perovskite thin film.
  • 1,4-diammonium butane has nearly the same length between its ammonium groups as occurs between formamidinium cations in the formamidinium lead iodide perovskite material crystal lattice. Accordingly, the 1,4-diammonium butane may substitute for two formamidinium ions during the formation of an FAPbL ⁇ material.
  • other alkyl polyammonium salts may be added to the lead halide precursor ink during formation of the perovskite material. For example, 1,8 diammonium octane, bis(4-aminobutyl)amine, and tris(4- aminobutyl)amine may be added. Additionally, the polyammonium polycations, including 1,4- diammonium butane, may provide the same benefits as the bulky organic cations described above by similar mechanisms to those described above with respect to the bulky organic cations.
  • FIG. 13 is a stylized illustration of an effect of addition of a 1,4-diammonium butane salt during the process of producing a perovskite material may have on the resulting perovskite 7000.
  • the 1,4-diammonium butane cation 7020 may substitute for two formamidinium cations 7010 in the perovskite material crystal lattice.
  • the spacing between formamidinium cations is approximately 6.35 A.
  • the length of the length of the 1,4-diammonium butane cation is approximately 6.28 A, a difference of only 0.07 A.
  • the 1,4-diammonium butane cation may substitute into the perovskite crystal lattice without significantly changing the properties or structure of the perovskite crystal lattice.
  • the addition of the 1,4-diammonium butane cation to a perovskite material may enhance the properties and stability of the perovskite material.
  • the 1,4-diammonium butane cation may act as a rigid structure within the perovskite material, increasing its structural and chemical durability.
  • perovskite material with added 1,4- diammonium butane cation may demonstrate superior dry heat stability compared to a perovskite material without 1,4-diammonium butane cation.
  • a perovskite material with added 1,4-diammonium butane cation may demonstrate a blue shift in the emission spectra of the perovskite material.
  • the 1,4-diammonium butane cation may be added at a concentration between 0 and 20 mol% to the formamidinium salt solution.
  • 1,4-diammonium butane cation may be added at a concentration between 1 and 5 mol% to the formamidinium salt solution. In a particular embodiment the 1,4-diammonium butane cation added at a concentration 5 mol% to the formamidinium salt solution.
  • FIG. 14 provides x-ray diffraction peaks (XRD) for perovskite having 0 mol%, 5 mol%, 10 mol%, and 20 mol% 1,4-diammonium butane (“DABF’). For each concentration the major peaks occur at the same points, indicating that the lattice parameters for a perovskite material do not change appreciably with addition of a concentration between 0 mol% and 20 mol% 1,4-diammonium butane.
  • the addition of 1,4-diammonium butane may create small intensity diffractions at less than 13° 2Q with Cu-Ka radiation, which are indicative of a small amount of 2D or layered perovskite phase.
  • FIG. 15 provides images of perovskite samples having 0 mol%, 1 mol%, 2.5 mol % and 5 mol% exposed to a temperature of 85 °C at 0% relative humidity for seven days.
  • the perovskite material with 0 mol% DABI shows significant lightening in color after one day and even more significant yellowing after seven days. This indicates that the perovskite material with 0 mol% DABI has degraded significantly after one day exposed to the testing conditions.
  • the perovskite material samples with 1 mol%, 2.5 mol% and 5 mol% all remain dark after seven days, indicating that addition of as little as 1 mol% DABI significantly increases so called“dry heat” stability of the perovskite material.
  • addition of 1,4-diammonium butane to a perovskite material may result in a slight blue shift of photoluminescence seen from a perovskite material when compared to a perovskite material without 1,4-diammonium butane.
  • This blue shift results from the passivation of trap states within the perovskite material resulting from the addition of 1,4- diammonium butane.
  • This blue shift indicates that the addition of 1,4-diammonium butane to a perovskite material decreases defect density in the perovskite material crystal lattice without changing the crystal structure of the perovskite material.
  • the resulting blue shift seen in an FAPbt perovskite material with 20 mol% of added 1,4- diammonium butane compared to a FAPbL ⁇ perovskite material without 1,4-diammonium butane is a change of 0.014 eV, from 1.538 eV with no 1,4-diammonium butane to 1.552 eV with 20 mol% 1,4-diammonium butane.
  • FIG. 16 illustrates three ammonium compounds, 1,8- diammonium octane, bis(4-aminobutyl)- ammonium and tris(4-aminobutyl)-ammonium, which may be added to a perovskite material in the same method as described above with respect to the 1,4-diammonium butane cation.
  • 1,8-diammonium octane may occupy the space of two formamidinium cations (“A-sites”) of a FAPbt perovskite material crystal lattice when introduced during the formation of the perovskite material as described above.
  • A-sites formamidinium cations
  • Bis(4-aminobutyl)-ammonium may occupy the space of three A-sites of a FAPbL ⁇ perovskite material crystal lattice when introduced during the formation of the perovskite material as described above.
  • Tris(4- aminobutyl)-ammonium may occupy the space of four A-sites of a FAPbt perovskite material crystal lattice when introduced during the formation of the perovskite material as described above.
  • FIGS. 16A-C provides a stylized illustration of an incorporation into FAPblg perovskite material crystal lattice of the three ammonium compounds illustrated in FIG. 16.
  • FIG. 16A is a stylized illustration incorporation of 1,8-diammonium octane into a FAPbh perovskite material crystal lattice 7100.
  • the 1,8-diammonium octane cation 7120 may substitute for two formamidinium cations 7110 in the perovskite material crystal lattice.
  • FIG. 16A is a stylized illustration incorporation of 1,8-diammonium octane into a FAPbh perovskite material crystal lattice 7100.
  • the 1,8-diammonium octane cation 7120 may substitute for two formamidinium cations 7110 in the perovskite material crystal lattice.
  • FIG. 16B is a stylized illustration incorporation of bis(4-aminobutyl)-ammonium into a FAPblg perovskite material crystal lattice 7200.
  • the bis(4-aminobutyl)-ammonium cation 7220 may substitute for three formamidinium cations 7210 in the perovskite material crystal lattice.
  • FIG. 16C is a stylized illustration incorporation of tris(4-aminobutyl)-ammonium into a FAPblg perovskite material crystal lattice 7300.
  • the tris(4- aminobutyl)-ammonium cation 7320 may substitute for four formamidinium cations 7310 in the perovskite material crystal lattice.
  • alkyl diammonium complexes with carbon chains between 2 and 20 carbon atoms may be added to a perovskite material.
  • a combination of ammonium complexes may be added to a perovskite material.
  • every range of values (of the form,“from about a to about b,” or, equivalently,“from approximately a to b,” or, equivalently, “from approximately a-b”) disclosed herein is to be understood as referring to the power set (the set of all subsets) of the respective range of values, and set forth every range encompassed within the broader range of values.
  • the terms in the claims have their plain, ordinary meaning unless otherwise explicitly and clearly defined by the patentee.

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